The Forty Years Moses Spent in Midian Changed Everything

The Book of Exodus skips over forty years of Moses's life with almost no comment. He flees Egypt after killing the taskmaster, arrives in Midian, marries Tzipporah, has children, and tends his father-in-law Jethro's sheep. Then, one day, he takes the flock to Horeb and sees a burning bush. Forty years of his life in three verses. The rabbis were not satisfied with this compression. They asked: what was God doing with Moses for four decades in the wilderness, and what happened to Moses during that time that made him ready for the burning bush?

Why Forty Years?

The number forty in the Hebrew Bible is not arbitrary. Forty days of flood. Forty days of Sinai. Forty years in the wilderness. The rabbis understood forty as the period of transformation — the minimum time required for a fundamental change in identity or capacity. Midrash Rabbah (Shemot Rabbah 1:32, c. 400-500 CE) asks specifically why God waited until Moses was eighty years old to reveal himself at the burning bush. The answer given: Moses needed forty years as a prince of Egypt to understand power, and forty years as a shepherd in Midian to understand humility. The liberation of Israel required someone who understood both — who had inhabited both the master's house and the servant's work. No shorter period in either role would have been sufficient.

The Talmud (Tractate Avot 5:21, Babylonian Talmud, compiled c. 500 CE) associates different stages of life with different capacities: forty is the age of understanding (binah). Moses's forty years in Midian were not idle waiting. They were the period in which he developed the specific form of understanding that prophecy requires — the ability to see the world from the outside, as a foreigner, without the assumptions of any single culture.

What Moses Learned From Shepherding

The choice of a shepherd as liberator was not incidental. Legends of the Jews (Louis Ginzberg, 1909-1938) preserves an extended tradition about Moses's shepherding that explains why God chose this occupation as his final preparation. Moses, the Midrash records, was tested as a shepherd before he was called as a prophet. One incident in particular became famous: a small kid ran away from the flock, and Moses chased it for miles until it reached a pool of water and stopped to drink. Moses, catching up, saw the animal panting and said: "I did not know you ran because you were thirsty. Now you must be tired." He picked up the kid and carried it back on his shoulders.

God, watching, said: "You have shown compassion in tending a flock belonging to flesh and blood; I swear you shall tend My flock, Israel." The shepherd test was not about herding technique. It was about whether Moses would see an individual animal's need within the collective management of a flock — whether he would stop and ask why the kid ran rather than simply forcing its compliance. A leader who could do that for a single sheep could do it for a people in the wilderness.

What Jethro Taught Moses

Jethro — Moses's father-in-law, a Midianite priest — appears briefly in Exodus 2-3 as a domestic character: the man whose daughter Moses married, the man whose flocks Moses tended. He reappears dramatically in Exodus 18 after the Exodus, when he arrives at the Israelite camp and, after a single day of watching Moses adjudicate cases from morning to evening, delivers a management critique that reshapes the judicial system of an entire nation.

The Talmud (Tractate Bava Kamma 92a) and several Midrash Aggadah traditions ask: how did Jethro have the standing to advise Moses? The answer points back to the forty years. Moses was not a stranger passing through Midian. He had lived in Jethro's household for forty years. He had observed Jethro as a functioning religious and political leader. Jethro had observed Moses. The Midrash notes that Moses did not come to the burning bush as a man who had spent forty years in isolation. He came as a man who had spent forty years watching how a wise leader managed complexity — and who therefore had the practical tools to receive and implement Jethro's later advice.

Was Moses Still Egyptian in Midian?

When Moses arrived at the well in Midian and rescued Jethro's daughters from the aggressive shepherds, the daughters went home and told their father: "An Egyptian man delivered us from the hands of the shepherds" (Exodus 2:19). Moses was identified as Egyptian by people who had just watched him act. He looked Egyptian, spoke Egyptian, dressed Egyptian. His Egyptian identity had not left him in the moment of flight. The rabbis found this significant: Moses did not arrive in Midian as an Israelite reclaiming his heritage. He arrived as an Egyptian prince in exile, whose Israelite identity would need to be excavated over the coming forty years.

This trajectory makes the burning bush more dramatic. The man standing before the bush saying "who am I, that I should go to Pharaoh?" (Exodus 3:11) was not a man who doubted his Israelite identity. By that point, forty years in Midian, he was Tzipporah's husband, Gershom's father, and Jethro's shepherd. But the transformation from Egyptian prince to Israelite prophet had required the full four decades. Exodus 3 is the conclusion of a character arc that began when an Egyptian nobleman looked at the slave labor and saw a human being being beaten — and could not walk past it.

What the Burning Bush Chose

The Midrash (Shemot Rabbah 2:5) asks why God appeared to Moses specifically in a thorn bush, rather than in a cedar or a fruit tree. The answer: the thorn bush was humble, low, associated with workers rather than kings. God was appearing in the most common, thorny, unglamorous plant in the Sinai wilderness to tell the former prince of Egypt that he was chosen. But also: the thorn bush burned without being consumed — a symbol, in rabbinic reading, of Israel in Egypt, afflicted and burning but never destroyed. Moses was being shown a visual argument: the burning continues, but the bush does not end. Neither will you.

Explore the full tradition of Moses's life in Midian, the burning bush, and the spiritual preparation of the first prophet in the Midrash Rabbah and Legends of the Jews collections at jewishmythology.com.