Albert Barnes Commentary Deuteronomy 6:3

"Hear therefore, O Israel, and observe to do it; that it may be well with thee, and that ye may increase mightily, as Jehovah, the God of thy fathers, hath promised unto thee, in a land flowing with milk and honey." — Deuteronomy 6:3 (ASV)

In the land - Better: As the Lord the God of your fathers promised you a land flowing with milk and honey.