The Great Epic of the Bhārata dynasty 1.189.31

1.189.31

sa cāpi keśau harirudbabarha śuklamekamaparaṃ cāpi kṛṣṇam |
tau cāpi keśau viśatāṃ yadūnāṃ kule striyau rohiṇīṃ devakīṃ ca |
tayoreko baladevo babhūva kṛṣṇo dvitīyaḥ keśavaḥ saṃbabhūva || 31 ||

[paragraph continues] And the illustrious god of the formidable bow, from his kindness, granted unto the five Indras the desire they cherished. And he also appointed that woman of extraordinary beauty, who was none else than celestial Sri (goddess of grace) herself, to be their common wife in the world of men. Accompanied by all those Indras, the god Isana then went unto Narayana of immeasurable energy, the Infinite, the Immaterial, the Uncreate, the Old, the Eternal, and the Spirit of these universes without limits. Narayana approved of everything. Those Indras then were born in the world of men. And Hari (Narayana) took up two hairs from his body, one of which hairs was black and the other white. And those two hairs entered the wombs of two of the Yadu race, by name Devaki and Rohini. And one of these hairs viz., that which was white, became Valadeva. And the hair that was black was born as Kesava's self, Krishna. And those Indras of old who had been confined in the cave on the Himavat are none else than the sons of Pandu, endued with great energy. And Arjuna amongst the Pandavas, called also Savyasachin (using both hands with equal dexterity) is a portion of Sakra.'