Deuteronomy 7:12 in the King James Version
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:
Context
11 You shall therefore keep the commandments, the statutes, and the ordinances which I command you today, to do them.
12 It shall happen, because you listen to these ordinances and keep and do them, that the LORD your God will keep with you the covenant and the loving kindness which he swore to your fathers.
13 He will love you, bless you, and multiply you. He will also bless the fruit of your body and the fruit of your ground, your grain and your new wine and your oil, the increase of your livestock and the young of your flock, in the land which he swore to your fathers to give you.