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