SB 9.6.10
sa tu viprena samvadam
jñapakena samacaran
tyaktva kalevaram yogi
sa tenavapa yat param
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Having been instructed by the great and learned brahmana Vasistha, who discoursed about the Absolute Truth, Maharaja Iksvaku became renounced. By following the principles for a yogi, he certainly achieved the supreme perfection after giving up his material body.