Acts 2:30

30A prophetπροφήτηςthereforeοὖνbeingὑπάρχων,andκαὶknowingεἰδὼςthatὅτιwith an oathὅρκῳsworeὤμοσενto himαὐτῷὁGodθεὸςout of [the]ἐκfruitκαρποῦof theτῆςloinsὀσφύοςof himαὐτοῦto setκαθίσαιuponἐπὶtheτὸνthroneθρόνονof himαὐτοῦ,

being therefore a prophet and knowing that God swore to him with an oath to seat one out of the fruit of his loins upon his throne.