Garudapurana 1.220.4

1.220.4

tataḥ pitṛbrāhmaṇahaste pātrasthapavitradānam /
pātrasthapuṣpeṇa śirasaḥ karapādārcanaṃ brāhmaṇahaste 'nya jaladānaṃ--hastābhyāṃ pātramutthāpya oṃ yā divyeti paṭhitvā oṃ amukagotra matpitāmaha amukadevaśarman sapatnīka eṣa te arghyaḥ svadhā /
pitṛpātreṇaiva pitāmahabrāhmaṇahaste stokamarghyodakaṃ sapavitraṅgṛhītvāstokamudakaṃ piṇḍasecanārthaṃ pātrāntareṇa pidhāya pitṛbrāhmaṇavāmapārśva dakṣiṇāgrakuśopari pitṛbhyaḥ stānamasīti adhomukhapātrasthapanam //

Then, giving the purifier situated in the vessel into the hand of the father's brāhmaṇa. / Worship of the head, hands, and feet with flowers situated in the vessel; giving other water into the brāhmaṇa's hand; lifting the vessel with both hands; reciting "Oṃ, yā divyāḥ…"; "Oṃ, of such-and-such gotra, my grandfather, such-and-such Devaśarman, with your wife, this is your arghya, svadhā!" / Taking a little arghya water with the purifier into the hand of the grandfather's brāhmaṇa using the father's vessel itself; covering it with another vessel with a little water for sprinkling the piṇḍa; placing the vessel face downwards on the kuśa grass whose tips point southward on the left side of the father's brāhmaṇa, with the words: "You are a place for the ancestors."