Caitanya-caritāmṛta 5.100-101
ananta-śayyāte tāṅhā karila śayana sahasra mastaka tāṅra sahasra vadanasahasra-caraṇa-hasta, sahasra-nayana sarva-avatāra-bīja, jagat-kāraṇa
[ananta-shayyaate taanhaa karila shayana sahasra mastaka taanra sahasra vadanasahasra-charana-hasta, sahasra-nayana sarva-avataara-beeja, jagat-kaarana]
Blended reading (Sanskrit + English inline)
ananta-śayyāte tāṅhā karila śayana sahasra mastaka tāṅra sahasra vadanasahasra-caraṇa-hasta, sahasra-nayana sarva-avatāra-bīja, jagat-kāraṇa
He lay there with Ananta as His bed. Lord Ananta is a divine serpent having thousands of heads, thousands of faces, thousands of eyes and thousands of hands and feet. He is the seed of all incarnations and is the cause of the material world.
Purport
In the reservoir of water first created by the perspiration of Garbhodakaśāyī Viṣṇu, the Lord lies on the Śeṣa plenary expansion of Viṣṇu, who is described in Śrīmad-Bhāgavatam and in the four Vedas as follows: sahasra-śīrṣā puruṣaḥ sahasrākṣaḥ sahasra-pātsa bhūmiṁ viśvato vṛtvā- tyatiṣṭhad daśāṅgulam The Viṣṇu form called Ananta-śayana has thousands of hands and legs and thousands of eyes, and He is the active generator of all the incarnations within the material world.
— A.C. Bhaktivedanta Swami Prabhupāda
My note
Source: vedabase.io