Śrīmad-Bhāgavatam 1.7.19
SB 1.7.19
Open the full passageSanskrit
yadāśaraṇam ātmānam aikṣata śrānta-vājinam astraṁ brahma-śiro mene ātma-trāṇaṁ dvijātmajaḥ
Translation
When the son of the brāhmaṇa [Aśvatthāmā] saw that his horses were tired, he considered that there was no alternative for protection outside of his using the ultimate weapon, the brahmāstra [nuclear weapon].