New Revised Standard Version
I warn everyone who hears the words of the prophecy of this book: if anyone adds to them, God will add to that person the plagues described in this book;

Contemporary English Version
Here is my warning for everyone who hears the prophecies in this book: If you add anything to them, God will make you suffer all the terrible troubles written in this book.

New American Bible
I warn everyone who hears the prophetic words in this book: if anyone adds to them, God will add to him the plagues described in this book,

Douay-Rheims Bible
For I testify to every one that heareth the words of the prophecy of this book: If any man shall add to these things, God shall add unto him the plagues written in this book.

For I testify to every one that heareth the words of the prophecy of this book: If any man shall add to these things, God shall add unto him the plagues written in this book.

testify.

Revelation 22:16 I, Jesus, have sent my angel, to testify to you these things in the churches. I am the root and stock of David, the bright and morning star.

Revelation 3:14 And to the angel of the church of Laodicea write: These things saith the Amen, the faithful and true witness, who is the beginning of the creation of God:

Ephesians 4:17 This then I say and testify in the Lord: That henceforward you walk not as also the Gentiles walk in the vanity of their mind:

1 Thessalonians 4:6 And that no man overreach nor circumvent his brother in business: because the Lord is the avenger of all these things, as we have told you before and have testified.

heareth.

Revelation 1:3 Blessed is he that readeth and heareth the words of this prophecy: and keepeth those things which are written in it. For the time is at hand.

If.

Deuteronomy 4:2 You shall not add to the word that I speak to you, neither shall you take away from it: keep the commandments of the Lord your God which I command you.

Deuteronomy 12:32 What I command thee, that only do thou to the Lord: neither add any thing, nor diminish.

Proverbs 30:6 Add not any thing to his words, lest thou be reproved and found a liar:

Matthew 15:6-9,13 And he shall not honour his father or his mother: and you have made void the commandment of God for your tradition. . . .

God.

Revelation 14:10,11 He also shall drink of the wine of the wrath of God, which is mingled with pure wine in the cup of his wrath: and shall be tormented with fire and brimstone in the sight of the holy angels and in the sight of the Lamb. . . .

Revelation 15:1 And I saw another sign in heaven, great and wonderful: seven angels having the seven last plagues. For in them is filled up the wrath of God.

Revelation 16:1 And I heard a great voice out of the temple, saying to the seven angels: Go and pour out the seven vials of the wrath of God upon the earth.

Revelation 19:20 And the beast was taken, and with him the false prophet who wrought signs before him, wherewith he seduced them who received the character of the beast and who adored his image. These two were cast alive into the pool of fire burning with brimstone.

Revelation 20:10,15 And the false prophet shall be tormented day and night for ever and ever. . . .

Leviticus 26:18,24,25,28,37 But if you will not yet for all this obey me: I will chastise you seven times more for your sins. . . .