The Law Code of Yājñavalkya 1.10.110

1.10.110

anantaraṃ yathāśakti hiraṇyarajatādidakṣiṇāṃ dattvā svadhāṃ vācayiṣya ity uktvā tair brāhmaṇair vācyatām ity anujñātaḥ prakṛtebhyaḥ pitrādibhyo mātāmahādibhyaś ca svadhocyatām iti svadhākāram udāharet || 1.244 ||

Then, having given a priestly gift of gold, silver, or the like according to his ability, saying "I shall cause the svadhā to be spoken," and being permitted by those Brahmins with "Let it be spoken," he should pronounce the call of "Svadhā," saying: "Let svadhā be uttered to those under consideration, namely the father and other ancestors, and the maternal grandfather and others." (1.244)