Skandapurana 5.179.180

5.179.180

iti śrīskāṃde mahāpurāṇa ekāśītisāhasryāṃ saṃhitāyāṃ ṣaṣṭhe nāgarakhaṇḍe brahmayajñopākhyāne yajñamaṇḍa paprāptabrāhmaṇasatkārapūrvakartvigādisthānayojanāpūrvakādhvarakarmāraṃbhonāmāśītyuttaraśatatamo'dhyāyaḥ .. 180 ..

Thus ends the one hundred and eightieth chapter, called 'The Commencement of the Sacrificial Rite Following the Welcoming of the Brahmins Arrived at the Sacrificial Pavilion and the Appointment to the Posts of Priests and Others' in the Story of the Sacrifice of Brahmā, in the Nāgarakhaṇḍa, the sixth [section], in the glorious Skanda Mahāpurāṇa consisting of eighty-one thousand verses.