Manava Dharmashastra 1.104

1.104

evaṃ sambandhadvāreṇa brāhmaṇārthatayā śāstraṃ stutvā'dhunā sākṣātstauti | idaṃ śāstraṃ jānānaḥ śaṃsitavrato bhavatīti paripūrṇayamaniyamānuṣṭhāyī bhavati | śāstrādananuṣṭhāne pratyavāyaṃ jñātvā tadbhayādanutiṣṭhati sarvān yamaniyamān yathāśāstraṃ sarvamanutiṣṭhati | anutiṣṭhanvihitātikramapratiṣiddhakarmajanitairdoṣaiḥ pāpaiḥ na lipyate na sambadhyate |

The Brāhmaṇa studying these institutes, and (thence) discharging all prescribed duties, is never defiled by sins of commission (or omission), proceeding from mind, speech or body.—(104)

Medhātithi’s commentary (manubhāṣya):
Having thus, indirectly through its co-relative, eulogised the Institutes as serving the purposes of the Brāhmaṇa, the Author now proceeds to eulogise them directly.

Knowing these Institutes, the Brāhmaṇa, comes to ‘discharge all prescribed duties,’—i.e. he observes all observances and practises full self-control; having learnt from the institutes that the omission of duties is sinful, he, fearing sin, fulfils all active and passive obligations (relating to observances and self-control),—doing everything in full conformity to the Institutes. Thus fulfilling all his duties, ‘he is not defiled’—affected—‘by the sins’ arising from the omission of duties prescribed and the commission of deeds prohibited.—(104)