Vishnupurana 3.1.37

3.1.37

tataḥ punaḥ sa vai devaḥ prāpte svārociṣentare /
tuṣitāyāṃ samutpanno hyājiṣastuṣitaiḥ saha //

The unequalled energy of Vishńu combining with the quality of goodness, and effecting the preservation of created things, presides over all the Manwantaras in the form of a divinity. Of a portion of that divinity Yajna was born in the Swáyambhuva Manwantara, the will-begotten progeny of Ákútí. When the Swárochisha Manwantara had arrived, that divine Yajna was born as Ajita, along with the Tushita gods, the sons of Tushitá. In the third Manwantara, Tushita was again born of Satyá, as Satya, along with the class of deities so denominated. In the next period, Satya became Hari, along with the Haris, the children of Harí. The excellent Hari was again born in the Raivata Manwantara, of Sambhúti, as Mánasa, along with the gods called Abhútarajasas. In the next period, Vishńu was born of Vikunthi, as Vaikuntha, along with the deities called Vaikunthas. In the present Manwantara, Vishńu was again born as Vámana, the son of Kaśyapa by Adití. With three paces he subdued the worlds, and gave them, freed from all embarrassment, to Purandara. These are the seven persons by whom, in the several Manwantaras, created beings have been protected. Because this whole world has been pervaded by the energy of the deity, he is entitled Vishńu, from the root Vis, 'to enter' or 'pervade;' for all the gods, the Manus, the seven Rishis, the sons of the Manus, the Indras the sovereigns of the gods, all are but the impersonated might of Vishńu.