Mahabharata 12.127.9

यम उवाच · yama uvāca

तपःशौचवता नित्यं सत्यधर्मरतेन चमातापित्रोरहरहः पूजनं कार्यमञ्जसा

tapaḥśaucavatā nityaṃ satyadharmaratena camātāpitroraharahaḥ pūjanaṃ kāryamañjasā

Our plain-language meaning of this verse is waiting for scholar review.