ἐπαυχεῖν

From LSJ

Κύριος εἶπεν πρὸς μέ Υἱός μου εἶ σύ, ἐγὼ σήμερον γεγέννηκά σε → the Lord said to me, My son you are; today I have begotten you

Source

Greek > English (Woodhouse Verbs Reversed)

(see also ἐπαυχέω): be proud of, boast of, pride oneself on