Deuteronomy 11:28 KJV
And a curse, if ye will not obey the commandments of the Lord your God, but turn aside out of the way which I command you this day, to go after other gods, which ye have not known.
Deuteronomy 11:28, King James Version
In context
27 A blessing, if ye obey the commandments of the Lord your God, which I command you this day:
28 And a curse, if ye will not obey the commandments of the Lord your God, but turn aside out of the way which I command you this day, to go after other gods, which ye have not known.
29 And it shall come to pass, when the Lord thy God hath brought thee in unto the land whither thou goest to possess it, that thou shalt put the blessing upon mount Gerizim, and the curse upon mount Ebal.