“But what does the scripture say?
‘Cast out the slave
And her son!
The son of the slave
Will not inherit
With the son of the free woman.’”
ἀλλὰ τί λέγει ἡ γραφή; Ἔκβαλε τὴν παιδίσκην καὶ τὸν υἱὸν αὐτῆς· οὐ γὰρ μὴ κληρονομήσει ὁ υἱὸς τῆς παιδίσκης μετὰ τοῦ υἱοῦ τῆς ἐλευθέρας.
Paul said, “But what does the scripture say (ἀλλὰ τί λέγει ἡ γραφή)? ‘Cast out the slave (Ἔκβαλε τὴν παιδίσκην) and her son (καὶ τὸν υἱὸν αὐτῆς)! The son of the slave (ὁ υἱὸς τῆς παιδίσκης) will not inherit (οὐ γὰρ μὴ κληρονομήσει) with the son of the free woman (μετὰ τοῦ υἱοῦ τῆς ἐλευθέρας).’” Paul continued with his comparison to Sarah and Hagar. He cited the words of Sarah to Abraham in Genesis, chapter 21:10, “So she said to Abraham, ‘Cast out this slave woman with her son. The son of this slave woman shall not inherit along with my son Isaac.’” Abraham and Sarah had a big feast on the day that Isaac was weaned. Sarah did not like to see Ishmael playing with her son Isaac, so she wanted to cast out Hagar, the Egyptian slave, with her son Ishmael. The next day, Abraham cast out Hagar with her son Ishmael. Paul used this incident to refute the Judaizers in Galatia, since Ishmael had been circumcised. A circumcised person was cast out of the family of Abraham, since circumcision did not save Ishmael. Thus, circumcision was not necessary for salvation. Have you had a problem about inheritance in your family?