King James Version
Look unto Abraham your father, and unto Sarah that bare you: for I called him alone, and blessed him, and increased him.English Standard Version
Look to Abraham your father and to Sarah who bore you; for he was but one when I called him, that I might bless him and multiply him.New International Version
look to Abraham, your father, and to Sarah, who gave you birth. When I called him he was but one, and I blessed him and made him many.