Moses said before the Holy One, blessed be He: Sovereign of all worlds! Make known to me Thy great and holy Name, that I may call on Thee by Thy Name, and Thou wilt answer me, as it is said, "And God said unto Moses, I am that I am" (Ex. 3:14). "And God further said (to Moses)" (Ex. 3:15).
The angels saw that the Holy One, blessed be He, had transmitted the secret of the Ineffable Name to Moses, and they rejoined: Blessed art thou, O Lord, who graciously bestoweth knowledge.
THE REVELATION ON SINAI THE sixth descent was when He came down on Sinai, as it is said, "And the Lord came down upon Mount Sinai" (Ex. 19:20). On the sixth of Sivan the Holy One, blessed be He, was revealed unto Israel on Sinai, and from His place was He revealed (on) Mount Sinai, and the heavens were opened, || and the summit of the mountain entered into the heavens. Thick darkness covered the mountain, and the Holy One, blessed be He, sat upon His throne, and His feet stood on the thick darkness, as it is said, "He bowed the heavens also, and came down; and thick darkness was under his feet" (2 Sam. 22:10).