For it is written that Abraham had two sons, one by the slave woman and the other by the free woman.
Γέγραπται γάρ, ὅτι Ἀβραὰμ δύο υἱοὺς ἔσχεν· ἕνα ἐκ τῆς παιδίσκης, καὶ ἕνα ἐκ τῆς ἐλευθέρας.
