Deuteronomy 12:32

What thing soever I command you, that shall ye observe to do: thou shalt not add thereto, nor diminish from it.

Deuteronomy 4:2

Ye shall not add unto the word which I command you, neither shall ye diminish from it, that ye may keep the commandments of Jehovah your God which I command you.

Joshua 1:7

Only be strong and very courageous, to observe to do according to all the law, which Moses my servant commanded thee: turn not from it to the right hand or to the left, that thou mayest have good success whithersoever thou goest.

Proverbs 30:6

Add thou not unto his words, Lest he reprove thee, and thou be found a liar.

Revelation 22:18-19

I testify unto every man that heareth the words of the prophecy of this book, if any man shall add unto them, God shall add unto him the plagues which are written in this book:

Deuteronomy 13:18

when thou shalt hearken to the voice of Jehovah thy God, to keep all his commandments which I command thee this day, to do that which is right in the eyes of Jehovah thy God.

Matthew 28:20

teaching them to observe all things whatsoever I commanded you: and lo, I am with you always, even unto the end of the world.

Treasury of Scripture Knowledge

Summary

What thing soever I command you, observe to do it: thou shalt not add thereto, nor diminish from it.

Bible References

Thou shalt not

Deuteronomy 4:2
Ye shall not add unto the word which I command you, neither shall ye diminish from it, that ye may keep the commandments of Jehovah your God which I command you.
Deuteronomy 13:18
when thou shalt hearken to the voice of Jehovah thy God, to keep all his commandments which I command thee this day, to do that which is right in the eyes of Jehovah thy God.
Joshua 1:7
Only be strong and very courageous, to observe to do according to all the law, which Moses my servant commanded thee: turn not from it to the right hand or to the left, that thou mayest have good success whithersoever thou goest.
Proverbs 30:6
Add thou not unto his words, Lest he reprove thee, and thou be found a liar.
Matthew 28:20
teaching them to observe all things whatsoever I commanded you: and lo, I am with you always, even unto the end of the world.
Revelation 22:18
I testify unto every man that heareth the words of the prophecy of this book, if any man shall add unto them, God shall add unto him the plagues which are written in this book:

General references

Genesis 6:22
Thus did Noah; according to all that God commanded him, so did he.
Genesis 21:4
And Abraham circumcised his son Isaac when he was eight days old, as God had commanded him.
Leviticus 8:4
And Moses did as Jehovah commanded him; and the congregation was assembled at the door of the tent of meeting.
Numbers 1:54
Thus did the children of Israel; according to all that Jehovah commanded Moses, so did they.
Deuteronomy 1:18
And I commanded you at that time all the things which ye should do.
Deuteronomy 4:2
Ye shall not add unto the word which I command you, neither shall ye diminish from it, that ye may keep the commandments of Jehovah your God which I command you.
Deuteronomy 11:32
And ye shall observe to do all the statutes and the ordinances which I set before you this day.
Psalm 119:4
Thou hast commanded us thy precepts, That we should observe them diligently.

American Standard Version Public Domain