Bhagavatapurana 9.22.23

9.22.23

mahyaṃ putrāya śāntāya paraṃ guhyamidaṃ jagau /
vicitravīryo 'thovāha kāśīrājasute balāt //

22. —The sage Krishna (Dwaipayana), protector of the Vedas, from whom I learned this. In preference to his disciples, Pila and others, the glorious Badarayana taught this most secret Bhagavata to me, his son possessed of a serene mind.

23. & 24. Then Vichitraveerya under compulsion married two daughters of Kasirajah, Ambika, and Ambalika, gained in a swayamvara (by Bhishma), but being too much attached in his heart to them, Vichitraveerya suffered from pthysis and died.