Vishnupurana 5.34.44

The army of Káśí, and the host of the demigods attendant upon Śiva, armed with all kinds of weapons, then sallied out to oppose the discus; but, skilled in the use of arms, he consumed the whole of the forces by his radiance, and then set fire to the city, in which the magic power of Śiva had concealed herself. Thus was Varánáśí burnt, with all its princes and their followers, its inhabitants, elephants, horses, and men, treasures and granaries, houses, palaces, and markets. The whole of a city, that was inaccessible to the gods, was thus wrapped in flames by the discus of Hari, and was totally destroyed. The discus then, with unmitigated wrath, and blazing fiercely, and far from satisfied with the accomplishment of so easy a task, returned to the hand of Vishńu.

The army of Káśí, and the host of the demigods attendant upon Śiva, armed with all kinds of weapons, then sallied out to oppose the discus; but, skilled in the use of arms, he consumed the whole of the forces by his radiance, and then set fire to the city, in which the magic power of Śiva had concealed herself. Thus was Varánáśí burnt, with all its princes and their followers, its inhabitants, elephants, horses, and men, treasures and granaries, houses, palaces, and markets. The whole of a city, that was inaccessible to the gods, was thus wrapped in flames by the discus of Hari, and was totally destroyed. The discus then, with unmitigated wrath, and blazing fiercely, and far from satisfied with the accomplishment of so easy a task, returned to the hand of Vishńu.