Bhagavatapurana 10.18.28

10.18.28

athāgata-smṛtir abhayo ripuṃ balo vihāya sārtham iva harantam ātmanaḥ /
ruṣāhanac chirasi dṛḍhena muṣṭinā surādhipo girim iva vajra-raṃhasā //

28. However (the next moment) Balarama recollected himself and became fearless as the asura was carrying him away from his friends through the sky as it were a treasure; and in great rage he hit the enemy on his head with his strong fist, even as Indra does a mountain with his rapid Vajra.