LXX Gen 21:12

εἶπεν δὲ ὁ θεὸς τῷ Ἀβραάμ Μὴ σκληρὸν ἴστω τὸ ῥῆμα ἐναντίον σου περὶ τοῦ παιδίου καὶ περὶ τῆς παιδίσκης· πάντα ὅσα ἐἀν εἴπῃ σοι Σάρρα, ἄκουε τῆς φωνῆς αὐτῆς· ὅτι ἐν Ἰσαὰκ κληθήσεταί σοι σπέρμα.

But God said to Abraham, “Do not be distressed about the boy and your maidservant. Listen to everything that Sarah tells you, for through Isaac your offspring will be reckoned.