One verse

Srimad Bhagavatam 10.63.23

10.63.23

अथ नारायण: देव: तं द‍ृष्ट्वा व्यसृजज्ज्वरम् । माहेश्वरो वैष्णवश्च युयुधाते ज्वरावुभौ ॥ २३ ॥

atha nārāyaṇaḥ devaḥ taṁ dṛṣṭvā vyasṛjaj jvaram māheśvaro vaiṣṇavaś ca yuyudhāte jvarāv ubhau

atha
thereupon
nārāyaṇaḥ devaḥ
Lord Nārāyaṇa (Kṛṣṇa)
tam
him (the Śiva-jvara)
dṛṣṭvā
seeing
vyasṛjat
released
jvaram
His personified fever (of extreme cold, as opposed to the extreme heat of the Śiva-jvara)
māheśvaraḥ
of Lord Māheśvara
vaiṣṇavaḥ
of Lord Viṣṇu
ca
and
yuyudhāte
fought
jvarau
the two fevers
ubhau
against each other

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.