Exodus 18:3

18:3 and her two sons, one of whom was named Gershom (for Moses had said, “I have been a foreigner in a foreign land”),

Exodus 21:8

21:8 If she does not please her master, who has designated her for himself, then he must let her be redeemed. He has no right to sell her to a foreign nation, because he has dealt deceitfully with her.