Mahabharata 12.63.20

अर्चयित्वा पितॄन्सम्यक्पितृयज्ञैर्यथाविधिदेवान्यज्ञैरृषीन्वेदैरर्चित्वा चैव यत्नतः

arcayitvā pitṝnsamyakpitṛyajñairyathāvidhidevānyajñairṛṣīnvedairarcitvā caiva yatnataḥ

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