Mahabharata 18.5.36

यश्चेदं श्रावयेच्छ्राद्धे ब्राह्मणान्पादमन्ततःअक्षय्यमन्नपानं वै पितॄंस्तस्योपतिष्ठते

yaścedaṃ śrāvayecchrāddhe brāhmaṇānpādamantataḥakṣayyamannapānaṃ vai pitṝṃstasyopatiṣṭhate

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