In the Varāha Purāṇa it is said:

(from Amnaya Sutra of Srila Bhaktivinode)

sarve nityāḥ śāśvatāś ca devād yasya parātmanaḥ heyopadeya-rahitāḥ naiva prakṛtijāḥ kvacit

“All the varied expansions of the Personality of Godhead are transcendental and eternal, and all of them repeatedly descend to all the different universes of the material creation. Their bodies, composed of eternity, bliss, and knowledge, are everlasting. […]