-Stated in the Book of Deuteronomy-

Moses's Covenant

" For you are a people sacred to The Lord, you god; he has chosen you from all the nations on the face of the earth to be a people peculiarly his own. It was not because you are the largest of all nations that The Lord set his heart on you and chose you, for you are really the smallest of all nations. It was because The Lord loved you and becaus of his fidelity to the oath he had sworn to your fathers, that he brought you out with his strong hand from the place of slavery and ransomed you from the hand of Pharoah, King of Egypt. Understand, then, that The Lord, your god, is in god indeed, the faithful god who keeps his mercifull covenant down to the thousandth generation toward those who love him and keep his commandments." (ft:7-6)

Aka- Covenant of Mount Sinai