Garudapurana 1.219.3

1.219.3

dakṣiṇajānu gṛhītvā adyāsmadīyāmukavṛddhau amukagātrāṇāmasmatprapitāmahīpitāmahīmātṝṇāmamukadevīnāmamukagotrāṇāṃ śrāddhe kartavye vasusatyasaṃjñakānāṃ viśveṣāṃ devānāṃ śrāddhaṃ siddhānnenayuṣmāsu mayā kartavyamiti devabrāhmaṇāmantraṇam /
oṃ kariṣyasīti tenokta itthamevāparadevabrāhmaṇāmantraṇam //

Grasping the right knee: "Today, on this auspicious occasion of ours, at the śrāddha to be performed for our great-grandmothers, grandmothers, and mothers, of such-and-such gotras and names, I shall perform the śrāddha with cooked food among you for the Viśvedevas named Vasu and Satya"—this is the invitation to the brāhmaṇas representing the deities. / When he has said, "Om, you may perform it," exactly in this manner is the invitation to the other brāhmaṇa representing the deities.