New Revised Standard Version
You must diligently observe everything that I command you; do not add to it or take anything from it.

Contemporary English Version
Obey all the laws and teachings I am giving you. Don't add any, and don't take any away.

New American Bible
Every word that I command you, you shall be careful to observe, neither adding to it nor subtracting from it.

Douay-Rheims Bible
What I command thee, that only do thou to the Lord: neither add any thing, nor diminish.

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

thou shalt not

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 13:18 When thou shalt hear the voice of the Lord thy God, keeping all his precepts, which I command thee this day, that thou mayst do what is pleasing in the sight of the Lord thy God.

Joshua 1:7 Take courage therefore, and be very valiant: that thou mayst observe and do all the law, which Moses my servant hath commanded thee: turn not from it to the right hand or to the left, that thou mayst understand all things which thou dost.

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

Matthew 28:20 Teaching them to observe all things whatsoever I have commanded you. And behold I am with you all days, even to the consummation of the world.

Revelation 22:18,19 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. . . .