Deuteronomy 7:11-13

11Thou shalt therefore keep the commandment, and the statutes, and the judgments, which I command thee this day, to do them.

12And it shall come to pass, because ye hearken to these judgments, and keep, and do them, that the LORD thy God shall keep with thee the covenant and the mercy which he sware unto thy fathers:

13and he will love thee, and bless thee, and multiply thee: he will also bless the fruit of thy body and the fruit of thy ground, thy corn and thy wine and thine oil, the increase of thy kine and the young of thy flock, in the land which he sware unto thy fathers to give thee.