Ramayana
अहमेव निहन्ता ऽस्मि रावणं सपुरःसरम् । देवता नन्दयिष्यामि ज्ञात्वा कालमुपागतम् । एतत्ते कथितं तत्त्वं देवराज शचीपते ॥ 7-27-20 ॥
I myself shall be the slayer of Ravana together with his vanguard, and I shall gladden the gods, knowing when the time has come. This is the truth I have told you, O king of the gods, O lord of Shachi.
english translation