So you shall not turn aside from any of the words which I command you this day, to the right or the left, to go after other gods to serve them.
Deuteronomy 28:14
Surrounding context
28:13 And the LORD will make you the head and not the tail; you shall be above only, and not be beneath, if you heed the commandments of the LORD your God, which I command you today, and are careful to observe them.
28:14 So you shall not turn aside from any of the words which I command you this day, to the right or the left, to go after other gods to serve them.
28:15 "But it shall come to pass, if you do not obey the voice of the LORD your God, to observe carefully all His commandments and His statutes which I command you today, that all these curses will come upon you and overtake you: