Vaishnava Dharmashastra 73.13

73.13

ye māmakāḥ pitara etad vaḥ pitaro 'yaṃ yajña iti ca havir anumantraṇaṃ kṛtvā yathopapanneṣu pātreṣu viśeṣād rajatamayeṣv annaṃ namo viśvebhyo devebhya ity annam ādau prāṅmukhayor nivedayet ||

After having consecrated the offerings with the Mantras, 'They, who are my ancestors,' 'This is your (share), O ye manes,' and 'This offering,' he must pour (what is left of) the food into such vessels as happen to be there, or (into golden ones at the offering addressed to the Visvedevâs and) into silver ones (at the offering addressed to the manes), and offer it first to the two Brâhmanas facing the east (who have been invited to the Srâddha of the gods).