Manava Dharmashastra 3.115

Manvarthamuktāvalī 3.115

yameva punaḥ śiṣyaṃ śuciṃ niyatendriyaṃ brahmacāriṇaṃ jānāsi tasmai vidyārūpanidhirakṣakāya pramādarahitāya māṃ vada|