Exodus 18:2-6

Then Jethro, Moses’ father-in-law, took Moses’ wife Zipporah, after he had sent her away [from Egypt], along with her two sons, of whom one was named Gershom (stranger), for Moses said, “I have been a stranger in a foreign land.” The other [son] was named Eliezer (my God is help), for Moses said, “The God of my father was my help, and He rescued me from the sword of Pharaoh.” Then Jethro, his father-in-law, came with Moses’ sons and his wife to [join] Moses in the wilderness where he was camped, at the mountain of God [that is, Mt. Sinai in Horeb]. He sent a message to Moses, “I, your father-in-law Jethro, am coming to you with your wife and her two sons [who are] with her.”