Mbh 3.167.1b

Thereupon, O lord, having bowed down unto those foremost of the celestials with regard, I duly accepted those mighty weapons. And then they recognised me as one of their own. Afterwards the gods repaired to the quarter from whence they had come. And that lord of the celestials, the divine Maghavan too having ascended his glorious chariot, said, ‘O Phalguna, thou shalt have to repair unto the celestial region. O Dhananjaya, even before this thy arrival I knew that thou wouldst come hither. Then I, have O best of the Bharatas, manifested myself unto thee. As formerly thou hadst performed thy ablution in the various tirthas and now hast performed severe austerities, so thou wilt be able to repair unto the celestial regions, O Pandava. Thou wilt, however, again have to practise extreme penance, for thou shouldst at any rate journey to heaven. And at my command, Matali shall take thee to the celestial regions. Thou hast already been recognised by the celestials and the celestial sages of high soul.’ Thereupon I said unto Sakra, ‘O divine one, be thou favourable unto me. With the view of learning arms do I beseech thee that thou mayst ‘be my preceptor.’ At this Indra said, ‘O child, having learnt weapons thou wouldst perform terrible deeds and with this object thou desirest to obtain the weapons. However, obtain thou the arms, as thou desirest.’ Then I said, ‘O slayer of foes, I never would discharge these celestial weapons at mortals except when all my other arms should have been baffled. Do thou, O lord of the celestials, grant me the celestial weapons (so that) I may hereafter, obtain the regions attainable by warriors.’ Indra said, ‘O Dhananjaya it is to try thee that I have said such words unto thee. Having been begotten of me this speech of thine well becometh thee.