Psalms of Solomon 17:5

σύ, Κύριε, ᾑρετίσω τὸν Δαυὶδ βασιλέα ἐπὶ Ἰσραήλ, καὶ σὺ ὠμοσας αὐτῷ περὶ τοῦ σπέρματος εἰς τὸν αἰῶνα, τοῦ μὴ ἐκλείπειν ἀπέναντί σου βασίλειον αὐτοῦ.

Swete's Septuagint