The puruṣa incarnation lying on the Causal Ocean is called the original puruṣa in the material creations, and in His virāṭ form, in whom all the planets and their inhabitants live, He has many thousands of legs and hands.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
यमाहुराद्यं पुरुषं सहस्राङ्घ्र्यूरुबाहुकम् । यत्र विश्व इमे लोकाः सविकासं समासते
yamāhurādyaṃ puruṣaṃ sahasrāṅghryūrubāhukam | yatra viśva ime lokāḥ savikāsaṃ samāsate
SB 3.7.22