Matsyapurana 47.27

47.27

ihotpannā manuṣyeṣu bādhante sarvamānavān
teṣāmutsādanārthāya utpanno yādave kule //

The valiant Yâdavas multiplied themselves into a race of three crores, out of whom 60000 powerful ones were born as incarnations of Devas on this earth. The incarnations of Asuras who were killed in the war between Devas and Asuras, were born on earth as obstructors of all human progress, and in order to destroy whom Śrî Kṛiṣṇa was born in the clan of the Yâdavas.—15-27.