Skandapurana 2.9.21.39

2.9.21.39

iti śrīskānde mahāpurāṇa ekāśītisāhasryāṃ saṃhitāyāṃ dvitīye vaiṣṇavakhaṇḍe śrīvāsudevamāhātmye brahmacāridharmanirūpaṇaṃ nāmaikaviṃśo'dhyāyaḥ .. 21 ..

Thus ends the twenty-first chapter, entitled 'Determination of the Duties of a Brahmacārin', in the Vāsudeva-māhātmya of the second [section], the Vaiṣṇavakhaṇḍa, in the Skanda Mahāpurāṇa of eighty-one thousand verses. // 21