Srimad-Bhagavatam: Canto 3 - Chapter 1 - Verse 22

Sanskrit:

यमाहुराद्यं पुरुषं सहस्राङ्‌घ्र्‌यूरुबाहुकम् ।यत्र विश्व इमे लोका: सविकाशं त आसते ॥ २२ ॥

ITRANS:

yam āhur ādyaṁ puruṣaṁsahasrāṅghry-ūru-bāhukamyatra viśva ime lokāḥsa-vikāśaṁ ta āsate

Translation:

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.

Purport:

The first puruṣa is Kāraṇodakaśāyī Viṣṇu, the second puruṣa is Garbhodakaśāyī Viṣṇu, and the third puruṣa is Kṣīrodakaśāyī Viṣṇu, in whom is contemplated the virāṭ-puruṣa, the gigantic form in which all the planets with their different developments and inhabitants are floating.