Augustine of Hippo

(cont. Faust. xvi. 24.) Moses set before the people of Israel no other God than the God of Abraham, Isaac, and Jacob, and Christ sets forth the very same God. So that so far was He from seeking to turn that people away from their own God, that He therefore threatened them with the outer darkness, because He saw them turned away from their own God. And in this kingdom He tells them the Gentiles shall sit down with Abraham, Isaac, and Jacob, for no other reason than that they held the faith of Abraham, Isaac, and Jacob. To these Fathers Christ gives His testimony, not as though they had been converted after death, or had received justification after His passion.