Śrīmad-Bhāgavatam · Text 10.90.42
Who is speaking and story frame
सङ्ख्यानं यादवानां क: करिष्यति महात्मनाम् ।
यत्रायुतानामयुतलक्षेणास्ते स आहुक: ॥ ४२ ॥
saṅkhyānaṁ yādavānāṁ kaḥ
kariṣyati mahātmanām
yatrāyutānām ayuta-
lakṣeṇāste sa āhukaḥ
Who can count all the great Yādavas, when among them King Ugrasena alone was accompanied by an entourage of thirty trillion attendants?
Read the purport on Vedabase.ioFrom Canto 10, chapter 14 onward, the translation and purports were completed by Śrīla Prabhupāda's disciples after his departure, and published by the Bhaktivedanta Book Trust.