10 And still further, Stephen, who was chosen the first deacon by the apostles, and who, of all men, was the first to follow the footsteps of the martyrdom of the Lord, being the first that was slain for confessing Christ, speaking boldly among the people, and teaching them, says: “The God of glory appeared to our father Abraham,... and said to him, Get you out of your country, and from your kindred, and come into the land which I shall show you;... and He removed him into this land, wherein you now dwell. And He gave him none inheritance in it, no, not so much as to set his foot on; yet He promised that He would give it to him for a possession, and to his seed after him.... And God spoke on this wise, That his seed should sojourn in a strange land, and should be brought into bondage, and should be evil-entreated four hundred years; and the nation whom they shall serve will I judge, says the Lord. And after that shall they come forth, and serve me in this place. And He gave him the covenant of circumcision: and so [Abraham] begot Isaac.” And the rest of his words announce the same God, who was with Joseph and with the patriarchs, and who spoke with Moses.
Source: Adversus haereses (New Advent)