sei puruṣa - the Supreme Personality of Godhead; virajāte - on the border known as Virajā; karena śayana - lies down; kāraṇa-abdhi-śāyī - Kāraṇābdhiśāyī; nāma - named; jagat-kāraṇa - is the original cause of material creation.

“That original Personality of Godhead, named Saṅkarṣaṇa, first lies down in the river Virajā, which serves as a border between the material and the spiritual world. As Kāraṇābdhiśāyī Viṣṇu, He is the original cause of the material creation.