Srimad-Bhagavatam: Canto 7 - Chapter 1 - Verse 60
Sanskrit:
सिद्धामृतरसस्पृष्टा वज्रसारा महौजस: ।उत्तस्थुर्मेघदलना वैद्युता इव वह्नय: ॥ ६० ॥
ITRANS:
siddhāmṛta-rasa-spṛṣṭāvajra-sārā mahaujasaḥuttasthur megha-dalanāvaidyutā iva vahnayaḥ
Translation:
When the dead bodies of the demons came in touch with the nectar, their bodies became invincible to thunderbolts. Endowed with great strength, they got up like lightning penetrating clouds.