Deuteronomy 7:9, 12-13

Understand, therefore, that the LORD your God is indeed God. He is the faithful God who keeps his covenant for a thousand generations and lavishes his unfailing love on those who love him and obey his commands.

“If you listen to these regulations and faithfully obey them, the LORD your God will keep his covenant of unfailing love with you, as he promised with an oath to your ancestors. He will love you and bless you, and he will give you many children. He will give fertility to your land and your animals. When you arrive in the land he swore to give your ancestors, you will have large harvests of grain, new wine, and olive oil, and great herds of cattle, sheep, and goats.