Afterward Moses and Aaron went and said to Pharaoh, "Thus says the Lord, the God of Israel, 'Let my people go, that they may hold a feast to me in the wilderness.'"...
Now Moses was keeping the flock of his father-in-law, Jethro, the priest of Midian, and he led his flock to the west side of the wilderness and came to Horeb, the mountain of God....
Again he began to teach beside the sea. And a very large crowd gathered about him, so that he got into a boat and sat in it on the sea, and the whole crowd was beside the sea on the land....