Deuteronomy 12:32
King James Version
“What thing soever I command you, observe to do it: thou shalt not add thereto, nor diminish from it.”
Context
29When the LORD thy God shall cut off the nations from before thee, whither thou goest to possess them, and thou succeedest them, and dwellest in their land;
30Take heed to thyself that thou be not snared by following them, after that they be destroyed from before thee; and that thou enquire not after their gods, saying, How did these nations serve their gods? even so will I do likewise.
31Thou shalt not do so unto the LORD thy God: for every abomination to the LORD, which he hateth, have they done unto their gods; for even their sons and their daughters they have burnt in the fire to their gods.
32What thing soever I command you, observe to do it: thou shalt not add thereto, nor diminish from it.