Skandapurana 2.9.11.83

2.9.11.83

iti śrīskānde mahāpurāṇa ekāśītisāhasryāṃ saṃhitāyāṃ dvitīye vaiṣṇavakhaṇḍe śrīvāsudevamāhātmye'mṛtamanthane viṣotpattirnāmaikādaśo'dhyāyaḥ .. 11 ..

Thus ends the eleventh chapter, named 'The Origin of the Poison during the Churning for Nectar,' in the Vāsudeva Māhātmya of the second [section], the Vaiṣṇavakhaṇḍa, in the glorious Skanda Mahāpurāṇa consisting of eighty-one thousand verses.