SB 8.6.17
eka evesvaras tasmin
sura-karye suresvarah
vihartu-kamas tan aha
samudronmathanadibhih
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Although the Supreme Personality of Godhead, the master of the demigods, was capable of performing the activities of the demigods by Himself, He wanted to enjoy pastimes in churning the ocean. Therefore He spoke as follows.