snāna-bhojana-homeṣu
japoccāre ca vāg-yataḥ
na cchindyān nakha-romāṇi
kakṣopastha-gatāny api
snāna - while bathing; bhojana - while eating; homeṣu - and while attending sacrificial performances; japa - while chanting mantras to oneself; uccāre - while passing stool or urine; ca - also; vāk-yataḥ - remaining silent; na - not; chindyāt - should cut; nakha - the nails; romāṇi - or hairs; kakṣa - in the armpits; upastha - pubic; gatāni - including; api - even.
Nārada Muni gives a similar technical description of Vedic brahmacārī life in Canto Seven, Chapter Twelve, of Śrīmad-Bhāgavatam.