Ramayana
ततस्तौ राम निघ्नन्तौ तदान्योन्यं महामृधे । न विह्वलौ न च श्रान्तौ बभूवतुरमर्षणौ ॥ 7-15-30 ॥
Then, O Rama, the two of them, smiting each other in that great battle, were neither overcome nor wearied, but remained full of wrath.
english translation