sa ittham bhagavan urvim
apsu nyasya yayau harih
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
In this manner the Personality of Godhead, Lord Visnu, the maintainer of all living entities, raised the earth from within the water, and having placed it afloat on the water, He returned to His own abode.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
The Personality of Godhead, Lord Visnu, descends by His will to the material planets in His innumerable incarnations for particular purposes, and again He goes back to His own abode. When He descends He is called an avatara because avatara means “one who descends.” Neither the Lord Himself nor His specific devotees who come to this earth are ordinary living entities like us.