Deuteronomy 12:32

Everything that I command you, ye shall take heed to do it; thou shalt not add thereto, nor take from it.

Deuteronomy 4:2

Ye shall not add to the word which I command you, neither shall ye take 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, that thou mayest take heed to do according to all the law that Moses my servant commanded thee. Turn not from it to the right or to the left, that thou mayest prosper 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 to every one who hears the words of the prophecy of this book, If any one shall add to these things, God shall add to him the plagues which are written in this book.

Deuteronomy 13:18

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

Matthew 28:20

teaching them to observe all things whatsoever I have enjoined you. And behold, I am with you all the days, until the completion of the age.

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 to the word which I command you, neither shall ye take from it, that ye may keep the commandments of Jehovah your God which I command you.
Deuteronomy 13:18
when thou hearkenest to the voice of Jehovah thy God, to keep all his commandments which I command thee this day, that thou mayest do what is right in the eyes of Jehovah thy God.
Joshua 1:7
Only be strong and very courageous, that thou mayest take heed to do according to all the law that Moses my servant commanded thee. Turn not from it to the right or to the left, that thou mayest prosper 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 have enjoined you. And behold, I am with you all the days, until the completion of the age.
Revelation 22:18
I testify to every one who hears the words of the prophecy of this book, If any one shall add to these things, God shall add to him the plagues which are written in this book.

General references

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