Charles Ellicott Commentary Deuteronomy 7:12

"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:" — Deuteronomy 7:12 (ASV)

At this point begins the third of the Hebrew divisions of the book.

If you hearken. —Literally, as a return for your hearkening. (See Note on Deuteronomy 8:19.)