Skandapurana 5.113.65

5.113.65

yathā syātsaṃkṣayasteṣāṃ nāgānāṃ sudurātmanām ..
yaiḥ kṛtaṃ naḥ puraṃ kṛtsnamudrasaṃ pāpakarmabhiḥ .. 65 ..

so that there may be the destruction of those extremely wicked nāgas / by whose sinful deeds our whole city has been ruined.”