For it is written in the law about Abraham’s two sons [Gen. 16]; one [was] by his slave woman [Hagar] and the other by the free woman, [his wife, Sarah].
What does the Scripture say about this matter? [It says, Gen. 21:10-12], “Get rid of the slave woman [Hagar], with her son [Ishmael]; for the son of the slave woman [Ishmael] will not inherit [what God promised to Abraham and his descendants], along with the son of the free woman [i.e., Isaac].”
Christ set us free [from condemnation under the Law of Moses], so we could stay free! Remain where you are then, and do not get tangled up again in the enslaving harness [of the Law of Moses].
For you brothers were called [by God] to enjoy your freedom; but do not use this freedom as an excuse for living a sinful life; instead, use it to render loving service to each other.