Śatapatha Brāhmaṇa ("of a hundred paths") 2.4.2.19

2.4.2.19

sa dadāti | asāvetatta ityeva yajamānasya pitre ye ca tvāmanvityu haika āhustadu tathā na brūyātsvayaṃ vai teṣāṃ saha yeṣāṃ saha tasmādu brūyādasāvetatta ityeva yajamānasya pitre 'sāvetatta iti pitāmahāyāsāvetatta iti prapitāmahāya tadyaditaḥ parāgdadāti sakṛdu hyeva parāñcaḥ pitarah

With, 'N.N., this for thee!' he presents (one cake) to the sacrificer's father. Some add, 'and for those who come after thee!' but let him not say this, since he himself is one of those to whom (it would be offered) in common: let him therefore merely say, 'N.N., this for thee!' as to the sacrificer's father; 'N.N., this for thee!' as to his grandfather; and 'N.N., this for thee!' as to his great-grandfather. He presents (the food) in an order (directed) away from the present time, because it is away from hence that the fathers have once for all departed.