Ramayana
मया हि भगवन्क्रोधात्प्रतिज्ञातं रणार्थिना । अवजेष्यामि चतुरो लोकपालानिति प्रभो ॥ 7-20-24 ॥
For I, O venerable one, eager for battle, have in my wrath made this vow, O lord: that I shall conquer the four guardians of the world.
english translation