Galatians 4:21-23 Common English Bible (CEB)
Slave versus free
21 Tell me—those of you who want to be under the Law—don’t you listen to the Law? 22 It’s written that Abraham had two sons, one by the slave woman and one by the free woman. 23 The son by the slave woman was conceived the normal way, but the son by the free woman was conceived through a promise.