Garudapurana 1.218.29

1.218.29

saumanasyamastu /
astvityukte pradattapiṇḍasthāne arghyārthapavitramocanam /
kuśapavitraṃ gṛhītvātena kuśena pitrādibrāhmaṇaṃ spṛṣṭvā svadhāṃ vācayiṣye-oṃ vācyatāṃ-oṃ pitṛpitāmahebhyo yathānāmaśarmabhyaḥ sapatnīkebhyaḥ svadhocyatām /
astusvadhā ityukte ūrjaṃ vahantīramṛtaṃ ghṛtamiti piṇḍopari vāridhārāṃ dadyāt //

"May there be good cheer." / When it is replied, "Let it be so," releasing the ring of kuśa-grass for the arghya in the place where the piṇḍa was offered; / having taken the purificatory kuśa-grass, touching the brāhmaṇa representing the father and ancestors with that kuśa: "I will recite the svadhā." "Om, let it be recited." "Om, let svadhā be uttered for the fathers and grandfathers, of such-and-such names and blessings, along with their wives." / When it is replied, "May there be svadhā," with the verse "Carrying nourishment, ambrosia, and clarified butter..." one should pour a stream of water over the piṇḍas.