Matsyapurana 141.79

141.79

ityete pitaro devā devāśca pitaraśca vai
anyonyapitaro hyete devāśca pitaro divi //

The giving of food with good faith is equivalent to the performance of Śrāddha. So Manu says The Śrāddha thus performed with devotion reaches the manes in every domain, this is what Manu has said and Sanatakumâra corroborates it after realizing the passages of the departed souls with His supernatural vision The dark fortnight forms the day of the Pitṛis and the bright one their night In this way, the Pitṛi Devas and the Deva Pitṛis are mutually their begetters These and the human Pitṛis live in the firmament and drink Soma—76 78