Deuteronomy 7:9, 12-13

Know therefore that the LORD your God is God; he is the faithful God, keeping his covenant of love to a thousand generations of those who love him and keep his commandments.

If you pay attention to these laws and are careful to follow them, then the LORD your God will keep his covenant of love with you, as he swore to your ancestors. He will love you and bless you and increase your numbers. He will bless the fruit of your womb, the crops of your land—your grain, new wine and olive oil—the calves of your herds and the lambs of your flocks in the land he swore to your ancestors to give you.