Manava Dharmashastra 3.269

3.269

yatkiñcitpitṛcyaṃ tatra karmaṇyayaṃ vidhiḥ | padārthāḥ prāgvyākhyātāḥ | atandriṇā analasena śraddhāneneti yāvat | ā nidhanādāmaraṇād, yāvajjīvikoyaṃ vidhirityarthaḥ | darbhapāṇinā | taduktaṃ darbhāḥ pavitramiti tadgrathitaśīrṣakaṃ darbhamayaṃ pavitramucyate |

Medhātithi’s commentary (manubhāṣya):
This injunction applies to every act that may be done in honour of the Pitṛs.

The special terms used have all been explained before.

‘With assiduity’—Without sloth; i.e., with due faith.

‘Until death.’— This shows that the injunction is meant to be observed as long as one lives.

‘With Kuśa-grass in his hand.’—It has been said above (under 256) regarding ‘Kuśa-grass, the Pavitra, &c.;’—‘pavitra’ is the name given to a thing made of Kuśa-grass, with a knot at the top.—(279)