Ramayana
केचित्समाहता भग्नाः पतिताः समरक्षितौ । ओष्ठांश्च दशनैस्तीक्ष्णैरदशन्कुपिता रणे ॥ 7-14-17 ॥
Some, struck down and broken, fell upon the field of battle; and enraged in the fight, they bit their lips with their sharp teeth.
english translation