Shiva Purana
दत्तं स्वधां पुरोधाय श्राद्धे प्रीणाति वै पितॄन्॥ वह्नेराप्यायनं कृत्वा सोमस्य तु यमस्य वै॥ ४॥
Giving Svadha to the priest in Shraddha pleases the ancestors. After offering drinks to the fire and to the moon and to Yama.
english translation
dattaM svadhAM purodhAya zrAddhe prINAti vai pitRRn॥ vahnerApyAyanaM kRtvA somasya tu yamasya vai॥ 4॥
hk transliteration by Sanscript