If you listen to these ordinances and keep them carefully, then the LORD your God will keep His covenant and the loving devotion that He swore to your fathers.
KJV
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:
ASV
And it shall come to pass, because ye hearken to these ordinances, and keep and do them, that Jehovah thy God will keep with thee the covenant and the lovingkindness which he sware unto thy fathers: