Manava Dharmashastra 6.30

6.30

aviśeṣeṇoktā anyāśca seveta | śākyapāśupatādidīkṣādisevanamapi prāptaṃ tanniṣedhati | ṛṣibhirmahābhārate saṃtapyamānāthaiḥ sevitā varṇyante | brāhmaṇaiśca gṛhasthairyāḥ sevitāḥ | yaduktam "uttareṣāṃ caitadavirodhīti" (gautamīye 3|8)| vidyā ātmaikatvavijñānam, tacchrutisevanena vṛddhiṃ nayet dṛḍhīkuryāt | śarīrasya ca śuddhaye āhāraniyamadīkṣāḥ seveta |

Medhātithi’s commentary (manubhāṣya):
It has just been stated in general terms that ‘he shall attend to others’; this might be taken to imply the propriety of practising the restraints and observances laid down in the ‘Śākya’, the‘Pāśupata’ and other heterodox scriptures. Hence the present verse is added for the purpose precluding these.

‘By sages.’—The Mahābhārata describes several restraints and observances practised by the ancient sages.

Those attended to by ‘Brāhmaṇa-householders’;—as has been declared under Gautama (3.9)—This refers to those coming later, also, because there is no incompatibility in this.’

‘Knowledge’—the realising of the unity of the Self; this one should ‘advance’—confirm, strengthen—by the study of the Veda.

‘For the purification of the body’—he should attend to the restraints relating to the regulation of food—(30).