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अथो गुरुकुले वासमिच्छन्तावुपजग्मतुः।काश्यं सान्दीपनिं नाम ह्यवन्तिपुरवासिनम् ३१(Bhag. Pura. 10.45.31)

अथो गुरुकुले वासमिच्छन्तावुपजग्मतुः।काश्यं सान्दीपनिं नाम ह्यवन्तिपुरवासिनम् ३१(Bhag. Pura. 10.45.31)

Being exceptional students Balarama and Krishna learned the Chaturdasha Vidyas and Chatusshasti Kalas (sixty-four arts) dhanurveda (science of archery) at the feet of Guru Sandipani. When Balarama and Krishna completed their studies they asked Guru Sandipani as to what he wanted by way of Gurudakshina (fee), and the guru wanted to get back his son, who was, years ago, drowned in Prabhasa tirtha. Accordingly Balarama and Krishna went to Prabhasa on the west coast. Samudra (deity of the seas)told them that it was the Asura called Pancajana, who lived in the sea in the form of a conch, who had killed their preceptor's son.  

Being exceptional students Balarama and Krishna learned the Chaturdasha Vidyas and Chatusshasti Kalas (sixty-four arts) dhanurveda (science of archery) at the feet of Guru Sandipani. When Balarama and Krishna completed their studies they asked Guru Sandipani as to what he wanted by way of Gurudakshina (fee), and the guru wanted to get back his son, who was, years ago, drowned in Prabhasa tirtha. Accordingly Balarama and Krishna went to Prabhasa on the west coast. Samudra (deity of the seas)told them that it was the Asura called Pancajana, who lived in the sea in the form of a conch, who had killed their preceptor's son.