Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 23
Sanskrit:
अथ नारायण: देव: तं दृष्ट्वा व्यसृजज्ज्वरम् ।माहेश्वरो वैष्णवश्च युयुधाते ज्वरावुभौ ॥ २३ ॥
ITRANS:
atha nārāyaṇaḥ devaḥtaṁ dṛṣṭvā vyasṛjaj jvarammāheśvaro vaiṣṇavaś cayuyudhāte jvarāv ubhau
Translation:
Seeing this personified weapon approach, Lord Nārāyaṇa then released His own personified fever weapon, the Viṣṇu-jvara. The Śiva-jvara and Viṣṇu-jvara thus battled each other.