Bhagavatapurana 3.9.16

3.9.16

* //
yo vā ahaṃ ca giriśaś ca vibhuḥ svayaṃ ca $ sthity-udbhava-pralaya-hetava ātma-mūlam &
yo vā ahaṃ ca giriśaś ca vibhuḥ svayaṃ ca $ sthity-udbhava-pralaya-hetava ātma-mūlam &
bhittvā tri-pād vavṛdha eka uru-prarohas % tasmai namo bhagavate bhuvana-drumāya //

16. I bow to the Almighty Lord who is the world-tree which is but one having three feet or branches, viz., Brahma, Vishnu and Rudra, each of which has innumerable branches, viz., Marichi, Manu and others—the tree that grows out of Prakriti

that has its root in Atman (that depends on Atman),—and which has differentiated itself as the three gunas under the names of Brahma (myself), Rudra and the Lord Vishnu Himself, who are the cause of the existence, the origin and the destruction of the world.