Bhagavatapurana 10.72.37.p3

10.72.37.p3

itthaṃ tayoḥ prahatayor gadayor nṛ-vīrau $ kruddhau sva-muṣṭibhir ayaḥ-sparaśair apiṣṭām &

their clubs thus broken, the two human heroes, enraged, struck each other with their fists, which felt like iron;