Exodus 18:10,11

Jethro said, Blessed be the Lord. — Heb., Jehovah. The Midianites, descendants of Abraham by Keturah, acknowledged the true God, and the Israelites could rightfully join with them in acts of worship. But it is scarcely likely that they knew God among themselves as “Jehovah.” Jethro, however, understanding Moses to speak of the supreme God under that designation, adopted it from him, blessed His name, and expressed his conviction that Jehovah was exalted above all other gods. The pure monotheism of later times scarcely existed as yet. The gods of the nations were supposed to be spiritual beings, really existent, and possessed of considerable power, though very far from omnipotent. (See Deuteronomy 32:16.)