Mahabharata 1.1.203

यश्चैनं श्रावयेच्छ्राद्धे ब्राह्मणान्पादमन्ततःअक्षय्यमन्नपानं तत्पितॄंस्तस्योपतिष्ठति

yaścainaṃ śrāvayecchrāddhe brāhmaṇānpādamantataḥakṣayyamannapānaṃ tatpitṝṃstasyopatiṣṭhati

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