Bhagavatapurana 5.25.1

5.25.1

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tasya mūla-deśe triṃśad-yojana-sahasrāntara āste yā vai kalā bhagavatas tāmasī samākhyātānanta iti sātvatīyā draṣṭṛ-dṛśyayoḥ saṅkarṣaṇam aham ity abhimāna-lakṣaṇaṃ yaṃ saṅkarṣaṇam ity ācakṣate //

1. Sree Suka said:—At the bottom of it (Patala), at a distance of 30 thousand yojanas, there is that Amsa of the Lord called Tamasa Amsa, also known as Ananta (Sesha). Followers of the Satvata Tantra denote Him by the term ‘Sankarshana’ or Aham, implying Abhimana or attachment, because he irresistibly draws together that which sees and that which is seen.