Manava Dharmashastra 3.182

3.182

akrodhanāḥ krodhavarjitāḥ | śaucaparāḥ | 'śaucaṃ' śuddhatā mṛdvāribhyāṃ prāyaścittenāntaḥśuddhayā vā | satataṃ śuddherviśeṣaṇam | tena niṣṭhīvanādāvācamanādi tatkṣaṇameva kartavyam | brahmacāriṇaḥ strīsambhogaṃ pariharanti | nyastaśastrāḥ | nyastaṃ tyaktaṃ śastraṃ yaiḥ | śastragrahaṇaṃ daṇḍapāruṣyāpalakṣaṇārtham | mahābhāgāḥ | audāryadhnitvādiguṇayogo ‘mahābhāgatā’ | yata evaṃvidhaṃ pitṝṇāṃ rūpaṃ, te ca brāhmaṇānāviśanti, atastaistadrūpadhāribhirbhavitavyamityarthavādenāyamartho vidhīyate | pūrvadevatāḥ pitaro nāma, kalpāntare'pyete devatā eveti stutiḥ | pūrvakālaṃ pitṝṇāmarcanīyatvātpūrvamahaṃṣvam |

The Pitṛs are the foremost gods, free from anger, ever intent on purity, chaste, rid of all means of offence, and supremely blessed.—(192)

Medhātithi’s commentary (manubhāṣya):
‘Free from anger’—without wrath.

‘Intent on purity,’—‘purity’ standing either for external purity obtained by means of clay and water, or internal purity obtained by means of expiatory rites.

‘Ever’—qualifies ‘purity.’ Hence the meaning is that, whenever one happens to spit or do any such unclean act, one should rinse one’s mouth immediately.

‘Chaste’—avoiding all intercourse with women.

‘Rid of all means of offence—those by whom the means of offence have been laid aside. ‘Offence’ stands for roughness and strife of all kinds.

‘Supremely blessed;’—‘blessedness’ consists in the presence of such qualities as nobility, prosperity, and so forth.

Since it is in all this form that the Pitṛs enter into the body of the Brāhmaṇas,—therefore, the Brāhmaṇas also should assume these same forms;—this is what is enjoined by means of the commendatory description contained in the verse.

‘Foremost gods.’—That in another time-cycle the ancestors were gods, is an eulogium bestowed on the ancestors. They are called ‘foremost’ because they are worshipped before the gods.—(192)