Moses brought our people together in the desert, and the angel spoke to him on Mount Sinai. There he was given these life-giving words to pass on to us.
What is the use of the Law? It was given later to show that we sin. But it was only supposed to last until the coming of that descendant who was given the promise. In fact, angels gave the Law to Moses, and he gave it to the people.
The LORD came from Mount Sinai. From Edom, he gave light to his people, and his glory was shining from Mount Paran. Thousands of his warriors were with him, and fire was at his right hand.