Matsyapurana 18.29

18.29

mukto 'pi lepabhāgitvaṃ prāpnoti kuśamārjanāt
lepabhājaścaturthādyāḥ pitrādyāḥ piṇḍabhāginaḥ
piṇḍadaḥ saptamasteṣāṃ sāpiṇḍyaṃ sāptapauruṣam //

When a śrâddha is performed with uncooked grain, then Agnikaraṇa and Piṇḍadâna should also be performed with the same. By the performance of sapiṇḍi-karaṇa, the deceased soul joins the first three groups of Pitṛis, and then it finds emancipation in process of time. Even after attaining emancipation they get their share of (lepa) śrâddha by the hands being wiped with a kuśa. From the 4th to the 6th generation, the forefathers get their share of śrâddha from the Kuśa wiping (lepa) and not piṇḍas, and three generations, father, grandfather and great grandfather, they are entitled to the ball of food (piṇḍa), the seventh being the giver of the Piṇḍa. These *seven* are known as sapiṇḍas for the sapiṇḍa hood includes these seven counting the performer of the sacrifice.—27-29.