Garudapurana 1.218.14

1.218.14

oṃ śundhantāṃ lokāḥ pitṛsadanāḥ pitṛsadanamasi /
adhomukhapāttrasparśanam /
amukagotrebhyo 'smatpitṛpitāmaha prapitāmahebhyaḥ sapatnīkebhya etāni gandhapuṣpadhūpadīpavāsoguṇasottarīyayajñopavītāni vaḥ svadhā pitṛtīrthena gandhādidānam /
gandhādidānamakṣayyamastu /
saṃkalpasiddhirastu /
brāhmaṇavacanam /
evaṃ mātāmahādīnāmanujñāpanādikarma /
oṃ yādivyetibhūmisaṃmārjanam /
tato ghṛtāktamannaṃ gṛhītvā dakṣiṇopavītī pitṛbrāhmaṇam oṃ agnau karaṇamahaṃ kariṣye /
oṃ kuruṣveti tenokte oṃ agnaye kavyavāhanāya svāhā iti āhutidvayaṃ devabrāhmaṇahaste dattvā avaśiṣṭānnaṃ piṇḍārthaṃ sthāpayitvā aparamardhaṃ pitrādipātre mātāmahādipātre ca niḥ kṣipet //

"Om, purified be the worlds, the abodes of the ancestors; you are an abode for the ancestors." / The upside-down vessel is touched. / "To our fathers, grandfathers, and great-grandfathers of such-and-such gotras, together with their wives: these perfumes, flowers, incense, lamps, a set of clothes with an upper cloth, and sacred threads are for you, svadhā"—perfumes and other items are offered through the ancestor-tīrtha. / "May the offering of perfumes and other items be inexhaustible." / "May the intention be fulfilled," / is the statement of the brāhmaṇa. / The rites of requesting permission and the rest are likewise performed for the maternal grandfathers and others. / The ground is wiped, saying, "Om, the divine [waters]..." / Then, having taken the food smeared with clarified butter, having the sacred thread over the right shoulder, [he says] to the brāhmaṇa representing the ancestors: "Om, I shall make the offering into the fire." / When he replies, "Om, make [it]," [saying,] "Om, svāhā to Agni who conveys the kavya offerings," having given two oblations into the hand of the divine brāhmaṇa and having set aside the remaining food for the piṇḍas, one should cast the other half into the vessel of the fathers and into the vessel of the maternal grandfathers.