As we wrap up chapter 4 today, Paul is going to use another story from the OT to prove his point about how we are brought into our relationship with God. Paul goes all the way back to Genesis again and retells the story of Hagar, Sarah, and the birth of each of their sons. It will be thorough this story from the OT that Paul will use to help the Galatian believers see that they need to reject legalism and cling to grace.