At the age of forty Moses kills an Egyptian, after he sees him beating a Hebrew to death, and escapes as a fugitive into the Sinai desert, where he is taken in by the Midianites and marries Zipporah, the daughter of the Midianite priest Jethro. When he is eighty years old, Moses is tending a herd of sheep in solitude on Mount Sinai when he sees a desert shrub that is burning but is not consumed. The God of Israel calls to Moses from the fire and reveals his name, Yahweh, and tells Moses that he is being sent to Pharaoh to bring the people of Israel out of Egypt.