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In the Bible
Moses spent 40 years in voluntary exile in Midian after killing an Egyptian. There, he married Zipporah, the daughter of Midianite priest Jethro (also known as Reuel). Jethro advised Moses on establishing a system of delegated legal decision-making.
Consequently, who did Moses live with in Midian?
Jethro
Besides, why did Moses flee from Egypt to Midian?
One day after Moses had reached adulthood he killed an Egyptian who was beating a Hebrew. Moses, in order to escape the Pharaoh's death penalty, fled to Midian (a desert country south of Judah), where he married Zipporah. During the journey, God tried to kill Moses, but Zipporah saved his life.
The age of Moses (Hebrew Mosheh) when he fled from Egypt is not stated in Exodus 2:15, but is given as 40 in The New Testament (Acts 7:23). Forty is one of a few ages assigned him in rabbinical traditions (18 and 20 being advocated by other exegetes).