One verse

Srimad Bhagavatam 3.26.25

3.26.25

सहस्रशिरसं साक्षाद्यमनन्तं प्रचक्षते । सङ्कर्षणाख्यं पुरुषं भूतेन्द्रियमनोमयम् ॥ २५ ॥

sahasra-sirasam saksad yam anantam pracaksate sankarsanakhyam purusam bhutendriya-manomayam

sahasra-sirasam
with a thousand heads
saksat
directly
yam
whom
anantam
Ananta
pracaksate
they all
sankarsana-akhyam
Sankarsana by name
purusam
the Supreme Personality of Godhead
bhuta
the gross elements
indriya
the senses
manah-mayam
consisting of the mind.

The threefold ahankara, the source of the gross elements, the senses and the mind, is identical with them because it is their cause. It is known by the name of Sankarsana, who is directly Lord Ananta with a thousand heads.