Ramayana
असम्भाव्यं वधं तस्य वृत्रस्य विबुधाधिपः । चिन्तयानो जगामाशु लोकस्यान्तं महायशाः ॥ 7-85-15 ॥
That lord of the gods, of great fame, reflecting that the slaying of Vritra was an inconceivable deed, swiftly fled to the end of the world.
english translation