Bhagavatapurana 3.7.22

3.7.22

yam āhur ādyaṃ puruṣaṃ sahasrāṅghry-ūru-bāhukam /
yatra viśva ime lokāḥ sa-vikāśaṃ ta āsate //

22. (Virat) whom the wise describe as the First Purusha, having a thousand feet, a thousand thighs and a thousand arms, and in whom all these worlds (beings) abide along with all their developments.