1163. dei
Lexical Summary
dei: It is necessary, must, ought

Original Word: δεῖ
Part of Speech: Verb
Transliteration: dei
Pronunciation: day
Phonetic Spelling: (die)
KJV: behoved, be meet, must (needs), (be) need(-ful), ought, should
NASB: must, ought, should, had, necessary, have, due
Word Origin: [third person singular active present of G1210 (δέω - bound), neuter active participle of the same, both used impersonally]

1. it is (was, etc.) necessary (as binding)

Strong's Exhaustive Concordance
needful, ought, should.

3d person singular active present of deo; also deon deh-on'; neuter active participle of the same; both used impersonally; it is (was, etc.) Necessary (as binding) -- behoved, be meet, must (needs), (be) need(-ful), ought, should.

see GREEK deo

HELPS Word-studies

1163 deí – properly, what must happen, i.e. what is absolutely necessary ("it behooves that . . . ").

NAS Exhaustive Concordance
Word Origin
a form of deó
Definition
it is necessary
NASB Translation
due (1), had (7), have (2), must (56), necessary (4), needed (1), ought (17), ought to (1), should (9).

Thayer's Greek Lexicon
STRONGS NT 1163: δεῖ

δεῖ; subjunctive present δέῃ; imperfect ἔδει; an impersonal verb (cf. Buttmann, § 132, 12; cf. § 131, 3; from Homer down); (δέω, namely, τίνος, to have need of, be in want of; cf. German esbedarf), it is necessary, there is need of, it behooves, is right and proper; followed either by the infinitive alone (cf. our one ought), or by the accusative with an infinitive (cf. Buttmann, 147 (129)), it denotes any sort of necessity; as a. necessity lying in the nature of the case: John 3:30; 2 Timothy 2:6.

b. necessity brought on by circumstances or by the conduct of others toward us: Matthew 26:35 (κἄν δέῃ με ἀποθανεῖν), cf. Mark 14:31; John 4:4; Acts 27:21; 2 Corinthians 11:30; (2 Corinthians 12:1 L T Tr WH text); or imposed by a condition of mind: Luke 2:49; Luke 19:5.

c. necessity in reference to what is required to attain some end: Luke 12:12; John 3:7; Acts 9:6; Acts 16:30; 1 Corinthians 11:19; Hebrews 9:26 (on this cf. Winers Grammar, 283 (266); (also Buttmann, 216 (187); 225 (195))); Hebrews 11:6.

d. a necessity of law and command, of duty, equity: Matthew 18:33; Matthew 23:23; Luke 11:42; Luke 13:14; Luke 15:32; Luke 18:1; Luke 22:7; John 4:20; Acts 5:29; Acts 15:5; Romans 1:27 (ἀντιμισθίαν, ἥν ἔδει, namely, ἀπολαμβάνεσθαι, the recompense due by the law of God); Romans 8:26; Romans 12:3; 1 Corinthians 8:2, etc. or of office: Luke 4:43; Luke 13:33; John 9:4; John 10:16; Ephesians 6:20; Colossians 4:4; 2 Timothy 2:24.

e. necessity established by the counsel and decree of God, especially by that purpose of his which relates to the salvation of men by the intervention of Christ and which is disclosed in the O. T. prophecies: Matthew 17:10; Matthew 24:6; Mark 9:11; Acts 4:12; 1 Corinthians 15:53; in this use, especially of what Christ was destined finally to undergo, his sufferings, death, resurrection, ascension: Luke 24:46 (R G L brackets); Matthew 26:54; John 3:14; Acts 3:21, etc. (of the necessity of fate in Herodotus 5, 33; with the addition κατά τό θεοπρόπιον, 8, 53; Thucydides 5, 26.) [SYNONYMS: δεῖ, χρή: δεῖ seems to be more suggestive of moral obligation, denoting especially that constraint which arises from divine appointment; whereas χρή signifies rather the necessity resulting from time and circumstance. Schmidt, chapter 150.]

STRONGS NT 1163: δέονδέον, δεοντος, τό (participle of δεῖ, which see), from (Sophocles and) Herodotus down, that of which there is need, which is requisite, due, proper: δέον ἐστι there is need, 1 Peter 1:6 (T Tr text WH omit; Tr marginal reading brackets ἐστι); followed by the accusative with an infinitive Acts 19:36; τά μή δέοντα that are not proper, 1 Timothy 5:13.

Topical Lexicon
The Sense of Absolute Necessity

Strong’s 1163 signals what cannot be otherwise. Whether on God’s calendar of redemption or in daily discipleship, the word marks events and duties fixed by the Lord’s will, not by human preference. Thus it frames history, prophecy, ethics, and pastoral practice with the same unyielding certainty.

Divine Necessity in the Saving Work of Christ

• Jesus repeatedly interprets His sufferings through this term. “From that time on Jesus began to show His disciples that He must go to Jerusalem and suffer many things…and be killed, and on the third day be raised to life” (Matthew 16:21).
• The word accompanies every Passion prediction (Mark 8:31; Luke 9:22) and resurfaces after the resurrection: “Was it not necessary for the Christ to suffer these things and then to enter His glory?” (Luke 24:26).
• The cross therefore stands, not as tragic accident, but as a divine imperative embedded in Scripture (Luke 24:44; Acts 17:3).

Prophetic Fulfillment Beyond the Passion

• “These are the words I spoke to you while I was still with you: everything written about Me…must be fulfilled” (Luke 24:44).
• The same word governs the unfolding of apostolic mission (Acts 13:47; though not using 1163, it reflects the same motif) and Paul’s appearance before Caesar: “You must testify in Rome” (Acts 23:11).
• Revelation opens and closes with the assurance that the visions “must soon take place” (Revelation 1:1; 22:6), anchoring eschatology in divine necessity, not speculation.

‘Must’ in Evangelism and Mission

• Jesus’ earthly itinerary: “I must preach the gospel of the kingdom of God to the other towns as well” (Luke 4:43).
• Samaritan outreach: “He had to pass through Samaria” (John 4:4), a divine compulsion that toppled ethnic barriers.
• Global thrust: “The gospel must first be proclaimed to all nations” (Mark 13:10).
• Paul’s resolve: “I must visit Rome” (Acts 19:21). God’s ‘must’ fuels strategic planning without surrendering to pragmatism.

Ethical Obligations for Believers

• Love-driven forgiveness: “Should you not have had mercy on your fellow servant, just as I had on you?” (Matthew 18:33).
• Weightier matters: “These you ought to have done without neglecting the others” (Matthew 23:23; Luke 11:42).
• Humility in knowledge: “If anyone thinks he knows something, he does not yet know as he ought to know” (1 Corinthians 8:2).
• Mutual edification in speech: “Your speech must always be gracious” (Colossians 4:6).

Pastoral Qualifications and Conduct

• Overseers “must be above reproach” (1 Timothy 3:2; Titus 1:7) and possess “a good reputation with outsiders” (1 Timothy 3:7).
• They “must hold firmly to the trustworthy word” to silence false teachers (Titus 1:11).
• Servant leadership: “The Lord’s servant must not be quarrelsome” (2 Timothy 2:24).

Corporate Worship and Prayer

• “God is Spirit, and His worshipers must worship in spirit and in truth” (John 4:24).
• Persistent corporate intercession: “They ought always to pray and not lose heart” (Luke 18:1).

Eschatological Certainty

• Birth-pangs of history: “These things must happen, but the end is still to come” (Matthew 24:6; Mark 13:7; Luke 21:9).
• Cosmic judgments: “He must be released for a short time” (Revelation 20:3) and “the beast…must remain for a little while” (Revelation 17:10).
• Bodily transformation: “This perishable body must be clothed with the imperishable” (1 Corinthians 15:53).

Personal Transformation and Growth

• Sanctified thinking: “Do not think of yourself more highly than you ought” (Romans 12:3).
• Dependence on the Spirit: “We do not know how we ought to pray, but the Spirit Himself intercedes for us” (Romans 8:26).
• Faith’s non-negotiable: “Without faith it is impossible to please God, because anyone who approaches Him must believe that He exists” (Hebrews 11:6).

Applications for the Contemporary Church

1. Confidence in Providence: What God declares necessary cannot fail; therefore the church can labor with assurance amid opposition.
2. Gospel Urgency: Evangelism is not optional; it is bound to the same must that sent Christ to the cross and Paul to Rome.
3. Ethical Clarity: Scripture’s “ought” transcends cultural trends, providing immovable standards for personal holiness and church order.
4. Hopeful Watchfulness: Eschatological “musts” call believers to readiness rather than alarm, knowing history unfolds by divine decree.

The recurring thread in all 104 occurrences is the sovereignty of God directing redemptive history and shaping the believer’s daily walk. What God deems necessary defines reality; wise disciples align their plans, prayers, and expectations with that unalterable “must.”

Forms and Transliterations
δεη δέη δέῃ δεήσει δει δεῖ δειν δεῖν δεον δέον δεοντα δεόντα δέοντα εδει έδει ἔδει dee deē déei déēi dei deî dein deîn deon déon deonta déonta edei édei
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Interlinear GreekInterlinear HebrewStrong's NumbersEnglishman's Greek ConcordanceEnglishman's Hebrew ConcordanceParallel Texts
Englishman's Concordance
Matthew 16:21 V-PIA-3S
GRK: αὐτοῦ ὅτι δεῖ αὐτὸν εἰς
NAS: His disciples that He must go
KJV: how that he must go unto
INT: of him that it is necessary for him to

Matthew 17:10 V-PIA-3S
GRK: ὅτι Ἠλίαν δεῖ ἐλθεῖν πρῶτον
NAS: say that Elijah must come first?
KJV: that Elias must first come?
INT: that Elijah must come first

Matthew 18:33 V-IIA-3S
GRK: οὐκ ἔδει καὶ σὲ
NAS: Should you not also have had
KJV: Shouldest not thou
INT: not did it behove also you

Matthew 23:23 V-IIA-3S
GRK: ταῦτα δὲ ἔδει ποιῆσαι κἀκεῖνα
NAS: but these are the things you should have done
KJV: these ought ye to have done,
INT: these moreover it behoved [you] to do and those [others]

Matthew 24:6 V-PIA-3S
GRK: μὴ θροεῖσθε Δεῖ γὰρ γενέσθαι
NAS: that you are not frightened, for [those things] must take place,
KJV: all [these things] must come to pass,
INT: not be alarmed it is necessary indeed to take place

Matthew 25:27 V-IIA-3S
GRK: ἔδει σε οὖν
NAS: Then you ought to have put my money
KJV: Thou oughtest therefore to have put
INT: it behoved you therefore

Matthew 26:35 V-PSA-3S
GRK: Πέτρος Κἂν δέῃ με σὺν
NAS: to Him, Even if I have to die
KJV: Though I should die with
INT: Peter Even if it were needful for me with

Matthew 26:54 V-PIA-3S
GRK: ὅτι οὕτως δεῖ γενέσθαι
NAS: be fulfilled, [which say] that it must happen
KJV: that thus it must be?
INT: that thus it must be

Mark 8:31 V-PIA-3S
GRK: αὐτοὺς ὅτι δεῖ τὸν υἱὸν
NAS: of Man must suffer
KJV: of man must suffer
INT: them that it is necessary for the Son

Mark 9:11 V-PIA-3S
GRK: ὅτι Ἠλίαν δεῖ ἐλθεῖν πρῶτον
NAS: say that Elijah must come first?
KJV: that Elias must first come?
INT: that Elijah must come first

Mark 13:7 V-PIA-3S
GRK: μὴ θροεῖσθε δεῖ γενέσθαι ἀλλ'
NAS: do not be frightened; [those things] must take place;
KJV: for [such things] must needs be;
INT: not be disturbed it must come to pass but

Mark 13:10 V-PIA-3S
GRK: ἔθνη πρῶτον δεῖ κηρυχθῆναι τὸ
NAS: The gospel must first be preached
KJV: And the gospel must first be published
INT: nations first must be proclaimed the

Mark 13:14 V-PIA-3S
GRK: ὅπου οὐ δεῖ ὁ ἀναγινώσκων
NAS: where it should not be (let the reader
KJV: where it ought not,
INT: where not it should he who reads

Mark 14:31 V-PSA-3S
GRK: ἐλάλει Ἐὰν δέῃ με συναποθανεῖν
KJV: If I should die with thee,
INT: he said If it is needful I to die with

Luke 2:49 V-PIA-3S
GRK: πατρός μου δεῖ εἶναί με
NAS: for Me? Did you not know that I had to be in My Father's
KJV: that I must be about
INT: father of me it behoves to be me

Luke 4:43 V-PIA-3S
GRK: εὐαγγελίσασθαί με δεῖ τὴν βασιλείαν
NAS: But He said to them, I must preach
KJV: I must preach the kingdom
INT: to preach good news me it behoves the kingdom

Luke 9:22 V-PIA-3S
GRK: εἰπὼν ὅτι Δεῖ τὸν υἱὸν
NAS: of Man must suffer
KJV: of man must suffer
INT: having said It is necessary for the Son

Luke 11:42 V-IIA-3S
GRK: ταῦτα δὲ ἔδει ποιῆσαι κἀκεῖνα
NAS: but these are the things you should have done
KJV: these ought ye to have done,
INT: These things also it behoved [you] to do and those

Luke 12:12 V-PIA-3S
GRK: ὥρᾳ ἃ δεῖ εἰπεῖν
NAS: hour what you ought to say.
KJV: hour what ye ought to say.
INT: hour what it behoves [you] to say

Luke 13:14 V-PIA-3S
GRK: ἐν αἷς δεῖ ἐργάζεσθαι ἐν
NAS: in which work should be done; so
KJV: in which men ought to work: in
INT: in which it behoves [men] to work in

Luke 13:16 V-IIA-3S
GRK: ἔτη οὐκ ἔδει λυθῆναι ἀπὸ
NAS: years, should she not have been released
KJV: And ought not this woman,
INT: years not ought [she] to be loosed from

Luke 13:33 V-PIA-3S
GRK: πλὴν δεῖ με σήμερον
NAS: Nevertheless I must journey on today
KJV: Nevertheless I must walk to day,
INT: but it behoves me today

Luke 15:32 V-IIA-3S
GRK: καὶ χαρῆναι ἔδει ὅτι ὁ
NAS: But we had to celebrate and rejoice,
KJV: It was meet that we should make merry,
INT: and rejoice was becoming because the

Luke 17:25 V-PIA-3S
GRK: πρῶτον δὲ δεῖ αὐτὸν πολλὰ
NAS: But first He must suffer many things
KJV: But first must he suffer
INT: first however it behoves him many things

Luke 18:1 V-PNA
GRK: πρὸς τὸ δεῖν πάντοτε προσεύχεσθαι
NAS: to show that at all times they ought to pray
KJV: unto them [to this end], that men ought always
INT: about the [way] it behoves always to pray

Strong's Greek 1163
104 Occurrences


δέῃ — 2 Occ.
δεῖ — 80 Occ.
δεῖν — 3 Occ.
δέον — 2 Occ.
δέοντα — 1 Occ.
ἔδει — 16 Occ.

1162
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