Midrash su Salmi 36:6

Isaac said to his father Abraham: O my father! Bind for me my two hands, and my two feet, so that I do not curse thee; for instance, a word may issue from the mouth because of the violence and dread of death, and I shall be found to have slighted the precept, "Honour thy father" (Ex. 20:12). He bound his two hands and his two feet, and bound him upon the top of the altar, and he strengthened his two arms and his two knees upon him, and put the fire and wood in order, and he stretched forth his hand and took the knife. Like a high priest he brought near his meal offering, and his drink offering; and the Holy One, blessed be He, was sitting and beholding the father binding with all (his) heart and the son bound with all (his) heart. And the ministering angels cried aloud and wept, as it is said, "Behold, the Erelim cry without; the angels of peace weep bitterly" (Isa. 33:7). The ministering angels said before the Holy One, blessed be He: Sovereign of all the worlds! Thou art called merciful and compassionate, whose mercy is upon all His works; have mercy upon Isaac, for he is a human being, and the son of a human being, and is bound before Thee like an animal. "O Lord, Thou preservest man and beast"; as it is said, "Thy righteousness is like the mighty mountains; thy judgments are like a great deep: O Lord, thou preservest man and beast" (Ps. 36:6).