Deuteronomy 11:26-29

26Behold, I set before you this day a blessing and a curse; 27A blessing, if ye obey the commandments of Yhwh your God, which I command you this day: 28And a curse, if ye will not obey the commandments of Yhwh 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. 29And it shall come to pass, when Yhwh 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.