Exodus 2:15

Now when Pharaoh heard this thing, he sought to slay Moses. But Moses fled from the face of Pharaoh, and dwelt in the land of Midian. And he sat down by a well. The land of the Midianites had no definite boundaries, but may be said to have extended eastward from the Aelanitic Gulf; some tribes, however, were found on the Peninsula of Sinai. He chose this country for his sojourn, pitching his tent near a well, apparently the only source of water for a long distance. This experience of Moses was to serve him in good stead in later years, for it is God's way of preparing great men for their life's work.