Manava Dharmashastra 2.109

2.109

ācāryaputraḥ śuśrūṣur jñānado dhārmikaḥ śuciḥ
āptaḥ śakto 'rthadaḥ sādhuḥ svo 'dhyāpyā daśa dharmataḥ //

According to the sacred law the (following) ten (persons, viz.) the teacher's son, one who desires to do service, one who imparts knowledge, one who is intent on fulfilling the law, one who is pure, a person connected by marriage or friendship, one who possesses (mental) ability, one who makes presents of money, one who is honest, and a relative, may be instructed (in the Veda).