Matsya Purana 249.64

249.64

abhavaccāgrato viṣṇurbhujamandarabandhanaḥ.
sa vāsukiphaṇālagna pāṇiḥ kṛṣṇo vyarājata .. 249.64 ..

Viṣṇu came forward, and with his arms, holding the lotus and as long as Brahmâṇḍa caught hold of the Mandara mountain, placing His hand on the hood of Vâsuki. Viṣṇu turned black on account of His having covered the mouth of Śeṣa. Then emitted from the oceans sounds like thousands of thunders. Indra, Sûrya Rudra and Vasus, Guhyakas placed themselves at the second end of Vâsuki.—64 66