What does 1 John 3:5 mean?
What is the meaning of 1 John 3:5?

But you know

“But you know” (1 John 3:5a) reminds believers of settled truth they have already received. John appeals to the certainty of faith, not speculation.

• This echoes 1 John 2:21, “I have not written to you because you do not know the truth, but because you do know it.”

• Scripture constantly calls us to remember what God has revealed (2 Peter 1:12–13; Jude 17).

• Knowing, in biblical terms, is relational and experiential, grounded in the Spirit’s testimony (Romans 8:16). The verse assumes that God’s Word is clear, reliable, and authoritative for every believer (Psalm 19:7–11).


Christ appeared

“Christ appeared” (1 John 3:5b) points to the Incarnation—God the Son entering history in real flesh and blood.

• John earlier wrote, “The Word became flesh and tabernacled among us” (John 1:14).

• His appearing fulfills promises dating back to Genesis 3:15 and Isaiah 7:14.

Hebrews 9:26 states, “He has appeared once for all…to do away with sin by the sacrifice of Himself.”

• The verb “appeared” underscores historical reality; Jesus is no myth but was seen, heard, and touched (1 John 1:1–2).


To take away sins

“…to take away sins” (1 John 3:5c) reveals the purpose of His coming.

• John the Baptist declared, “Look, the Lamb of God, who takes away the sin of the world!” (John 1:29).

• The phrase ties to the Day of Atonement imagery where the scapegoat carried sin away (Leviticus 16:21–22).

• Jesus removes guilt, penalty, and power of sin (Colossians 2:13–14; Romans 6:6–7).

• This is substitutionary: “He Himself bore our sins in His body on the tree” (1 Peter 2:24).

• The completeness of the work means believers stand cleansed (Hebrews 10:14).


In Him there is no sin

“…and in Him there is no sin” (1 John 3:5d) underscores His sinless nature.

• Jesus challenged His opponents, “Which of you can prove Me guilty of sin?” (John 8:46). Silence followed.

2 Corinthians 5:21 affirms, “God made Him who knew no sin to be sin for us.”

Hebrews 4:15 calls Him “without sin,” ensuring He could be the spotless Lamb (1 Peter 1:19).

• Because He is sinless, His sacrifice is wholly sufficient (Hebrews 7:26–27).

• His purity becomes the believer’s model: “Whoever claims to abide in Him must walk as Jesus walked” (1 John 2:6).


summary

1 John 3:5 proclaims four intertwined certainties: believers already know the truth; Jesus truly entered history; His mission was to lift our sins away; and He could do so because He is perfectly sinless. Holding these truths fuels assurance, gratitude, and a life that reflects His holiness.

Why is the concept of law important in 1 John 3:4?
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