The Supreme Personality of Godhead said: Know from Me that this is the act of the son of Droṇa. He has thrown the hymns of nuclear energy [brahmāstra], and he does not know how to retract the glare. He has helplessly done this, being afraid of imminent death.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
श्रीभगवानुवाच । वेत्थेदं द्रोणपुत्रस्य ब्राह्ममस्त्रं प्रदर्शितम् । नैवासौ वेद संहारं प्राणबाध उपस्थिते
śrībhagavānuvāca | vetthedaṃ droṇaputrasya brāhmamastraṃ pradarśitam | naivāsau veda saṃhāraṃ prāṇabādha upasthite
SB 1.7.27