They were the men who were speaking to Pharaoh king of Egypt, in order to bring the Israelites out of Egypt. It was the same Moses and Aaron.

When the sound of the horn grew louder and louder, Moses was speaking and God was answering him with a voice.

He gave Moses two tablets of testimony when he had finished speaking with him on Mount Sinai, tablets of stone written by the finger of God.

When Moses finished speaking with them, he would put a veil on his face.