The Troparion for the feast today reads:
O prophet Moses, you reached the summit of virtues. By this you came to see the glory of God. You received the tablets of the grace-giving Law and became the crown of prophets and a mystery of piety; for you carried grace deep within you.
On Mt. Horeb the great prophet Moses saw God in the bush that burned without being consumed, and God revealed his Name to him, “I am who I am.” (Exodus 3:14) It is this Name of God that we invoke in the Anaphora of St. Basil the Great, “O Eternal Being … “ On Mt. Sinai God revealed a portion of his glory to Moses when he gave him the ten commandments. On Mt. Tabor, Moses stood with Elijah to witness the glory of God revealed though Jesus.