Odes 9:55

καθὼς ἐλάλησεν πρὸς τοὺς πατέρας ἡμῶν, τῷ Ἀβραὰμ καὶ τῷ σπέρματι αὐτοῦ ἕως αἰῶνος

Swete's Septuagint