SB 8.7.23
guna-mayya sva-saktyasya
sarga-sthity-apyayan vibho
dhatse yada sva-drg bhuman
brahma-visnu-sivabhidham
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
O lord, you are self-effulgent and supreme. You create this material world by your personal energy, and you assume the names Brahma, Visnu and Mahesvara when you act in creation, maintenance and annihilation.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
This prayer is actually offered to Lord Visnu, the purusa, who in His incarnations as the guna-avataras assumes the names Brahma, Visnu and Mahesvara.