Rabbi Jehudah said: In that night was the Holy One, blessed be He, revealed unto him, and He said unto him: Abraham! "Take now thy son, thine only son, whom thou lovest, even Isaac" (Gen. 22:2). And Abraham, having pity upon Isaac, said before Him: Sovereign of all worlds! Concerning which son dost Thou decree upon me? Is it concerning the son lacking circumcision, or the son born for circumcision? He answered him: "Thine only son." He rejoined: This one is the only son of his mother, and the other son is the only son of his mother. He said to him: "The one, whom thou lovest." He said to Him: Both of them do I love. He said to him: "Even Isaac."