Text 13] Lord Krṣṇa Shows the Universal Form
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Bala. Moreover, because He unites two families—Vasudeva's family and the family of Nanda Mahārāja—He will be known as Saṅkarṣaṇa.
PURPORT
Baladeva was actually the son of Devakī, but He was transferred from Devakī's womb to that of Rohiṇī. This fact was not disclosed. According to a statement in the  Hari-vaṁśa :
pratyuvāca tato rāmaḥ sarvāṁs tān abhitaḥ sthitān yādaveṣv api sarveṣu bhavanto mama vallabhāḥ
Gargamuni did disclose to Nanda Mahārāja that Balarāma would be known as Saṅkarṣaṇa because of uniting two families—the  yadu-vaṁśa  and the  vaṁśa  of Nanda Mahārāja—one of which was known as  kṣatriya  and the other as  vaiśya . Both families had the same original forefather, the only difference being that Nanda Mahārāja was born of a  vaiśya  wife whereas Vasudeva was born of a  kṣatriya  wife. Later, Nanda Mahārāja married a  vaiśya  wife, and Vasudeva married a  kṣatriya  wife. So although the families of Nanda Mahārāja and Vasudeva both came from the same father, they were divided as  kṣatriya  and  vaiśya . Now Baladeva united them, and therefore He was known as Saṅkarṣaṇa.
TEXT 13
आसन् वर्णस्त्रयो ह्यस्य गृह्णतोऽनुयुगं तनूः । शुक्लो रक्तस्तथा पीत इदानीं कृष्णतां गतः ॥१३॥
āsan varṇās trayo hy asya gṛhṇato 'nuyugaṁ tanūḥ śuklo raktas tathā pīta idānīṁ krṣṇatāṁ gataḥ
āsan—were assumed; varṇāḥ trayaḥ—three colors; hi—indeed; asya—of your son Krṣṇa; gṛhṇataḥ—accepting; anuyugam tanūḥ—