Deuteronomy Chapter 4, Verse 2
From BibleWiki
2: Ye shall not add unto the word which I command you, neither
shall ye diminish ought from it, that ye may keep the
commandments of the LORD your God which I command you.
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.
2: Ye shall not add to the word which I command you, and ye shall not take from it: keep the commandments of the Lord our God, all that I command you this day.
Deuteronomy Chapter 4, Verse 2/commentary

