Bhagavatapurana 5.17.16

5.17.16

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bhavānīnāthaiḥ strī-gaṇārbuda-sahasrair avarudhyamāno bhagavataś caturmūrter mahā-puruṣasya turīyāṃ tāmasīṃ mūrtiṃ prakṛtim ātmanaḥ saṅkarṣaṇa-saṃjñām ātma-samādhi-rūpeṇa sannidhāpyaitad abhigṛṇan bhava upadhāvati //

16. (There) dutifully waited upon by Arbuda thousands of women headed by Parvati, God Siva is busily engaged in the worship of the Fourth Form, directing the work of Tamas, of the supreme Person, the glorious Narayana of four forms who is His own cause and who is called Sankarshana, whose presence God Siva has secured by the intensity of devout contemplation and by singing His praises as follows.

17. The Lord said:—