Wherefore it shall come to pass, if ye hearken to these judgments, and keep, and do them, that the Lord thy God shall keep unto thee the covenant and the mercy which he sware unto thy fathers: (Deuteronomy 7:12)
The word translated “if” is actually a noun meaning “consequence.” It is usually used as an adverb meaning “as a consequence of,”“because of.” Accordingly, the translation here would be, not “if,” but, “as a consequence of,” pointing to the rewards for heeding the precepts of the Lord.