Vishnupurana 3.15.p2

3.15.p2

"Thus the householder, with faith, should offer oblations to the maternal grand father along with the worship of Viswadevas or he should perform the Viswadevas ceremony. He should feed the Brahmins, who are for the gods and maternal ancestors with their faces to the east. And there who are for the paternal ancestors and ancestors in general should be fed with their faces to the north. Some say, O king, that separate Srāddha should be performed for these two classes of ancestors and others hold that they should both be entertained with the same food. The wise should spread Kusā grass for the seats of the Brāhmans and then worship them with libations; and having received permission from them he should then invoke the deities. Then the man who is acquainted with the ritual should offer a libation to the gods with water and barley and then flowers, perfumes and incense. Then he should offer libations to the manes placed upon his left; and having first provided seats of Kusā grass, he, with the permission of the Brāhmans, should invoke with the usual prayers, the manes to the ceremony, offering libation on his left hand of water and sesamum. If any guest arrives at the time who is desirous of eating or who is passing along the road he should worship him with the permission of Brāhmans; for the saints, for the behoof of mankind, travel over the earth disguised in various shapes and forms. It is for this reason, O king, that the wise worship a person who comes at such an hour—and if a guest is neglected—the fruits of an ancestral offering are baffled.