Then spake Abraham to God, "Shall I go hence without having offered up a sacrifice?" Whereunto God replied, and said, "Lift up thine eyes, and behold the sacrifice behind thee."[244] And Abraham lifted up his eyes, and, behold, behind him a ram caught in the thicket, which God had created in the twilight of Sabbath eve in the week of creation, and prepared since then as a burnt offering instead of Isaac. And the ram had been running toward Abraham, when Satan caught hold of him and entangled his horns in the thicket, that he might not advance to Abraham. And Abraham, seeing this, fetched him from the thicket, and brought him upon the altar as an offering in the place of his son Isaac. And Abraham sprinkled the blood of the ram upon the altar, and he exclaimed, and said, "This is instead of my son, and may this be considered as the blood of my son before the Lord." And whatsoever Abraham did by the altar, he exclaimed, and said, "This is instead of my son, and may it be considered before the Lord in place of my son." And God accepted the sacrifice of the ram, and it was accounted as though it had been Isaac.[245] As the creation of this ram had been extraordinary, so also was the use to which all parts of his carcass were put. Not one thing went to waste. The ashes of the parts burnt upon the altar formed the foundation of the inner altar, whereon the expiatory sacrifice was brought once a year, on the Day of Atonement, the day on which the offering of Isaac took place. Of the sinews of the ram, David made ten strings for his harp upon which he played. The skin served Elijah for his girdle, and of his two horns, the one was blown at the end of the revelation on Mount Sinai, and the other will be used to proclaim the end of the Exile, when the "great horn shall be blown, and they shall come which were ready to perish in the land of Assyria, and they that were outcasts in the land of Egypt, and they shall worship the Lord in the holy mountain at Jerusalem."[246] When God commanded the father to desist from sacrificing Isaac, Abraham said: "One man tempts another, because he knoweth not what is in the heart of his neighbor. But Thou surely didst know that I was ready to sacrifice my son!" God: "It was manifest to Me, and I foreknew it, that thou wouldst withhold not even thy soul from Me." Abraham: "And why, then, didst Thou afflict me thus?" God: "It was My wish that the world should become acquainted with thee, and should know that it is not without good reason that I have chosen thee from all the nations. Now it hath been witnessed unto men that thou fearest God."[247] Hereupon God opened the heavens, and Abraham heard the words, "By Myself I swear!" Abraham: "Thou swearest, and also I swear, I will not leave this altar until I have said what I have to say." God: "Speak whatsoever thou hast to speak!" Abraham: "Didst Thou not promise me Thou wouldst let one come forth out of mine own bowels, whose seed should fill the whole world?"