A class on Srimad Bhagavatam 1.15.39 given by His Divine Grace A.C. Bhaktivedanta Swami Prabhupada on December 17, 1973 in Los Angeles, CA.
Srimad Bhagavatam 1.15.39
mathurāyāṁ tathā vajraṁ
śūrasena-patiṁ tataḥ
prājāpatyāṁ nirūpyeṣṭim
agnīn apibad īśvaraḥ
Then he posted Vajra, the son of Aniruddha [grandson of Lord Kṛṣṇa], at Mathurā as the King of Śūrasena. Afterwards Mahārāja Yudhiṣṭhira performed a Prājāpatya sacrifice and placed in himself the fire for quitting household life.