Mahabharata 1.121.2

1.121.2

nālpadhīrnāmahābhāgastathānānāstrakovidaḥ |
nādevasattvo vinayetkurūnastre mahābalān || 2 ||

"Vaisampayana said, 'Desirous of giving his grandsons a superior education, Bhishma was on the look-out for a teacher endued with energy and well-skilled in the science of arms. Deciding, O chief of the Bharatas, that none who was not possessed of great intelligence, none who was not illustrious or a perfect master of the science of arms, none who was not of godlike might, should be the instructor of the Kuru (princes), the son of Ganga, O tiger among men, placed the Pandavas and the Kauravas under the tuition of Bharadwaja's son, the intelligent Drona skilled in all the Vedas. Pleased with the reception given him by the great Bhishma, that foremost of all men skilled in arms, viz., illustrious Drona of world-wide fame, accepted the princes as his pupils. And Drona taught them the science of arms in all its branches. And, O monarch, both the Kauravas and the Pandavas endued with immeasurable strength, in a short time became proficient in the use of all kinds of arms.'