2whichὃHe promised beforehandπροεπηγγείλατοthroughδιὰtheτῶνprophetsπροφητῶνof Himαὐτοῦinἐν[the] ScripturesγραφαῖςHolyἁγίαις
which He promised beforehand through His prophets in Holy Scriptures,
προεπηγγείλατο
προεπαγγέλλομαι
I promise beforehand.
