Valmiki Ramayana Kishkindha Kanda Sarga 12 Shloka 18

क्रोधमूर्छितौ senseless with fury, भ्रातरौ brothers, अशनिकल्पैः like thunder, तलैः with palms soles, वज्रकल्पैः like thunderbolts, मुष्टिभिः with fists, समरे in the combat, अन्योन्यम् each other, जघ्नतुः struck.

The brothers, insensate with fury, struck each other like thunder with their palms, soles and fists in the combat.