Vishnupurana 3.15.53

3.15.53

varjyāni kurvatā śrāddhaṃ kopo 'dhvagamanaṃ tvarā
bhoktur apy atra rājendra trayam etan na śasyate //

"In this manner an enlightened householder will celebrate the obsequial worship of his paternal and maternal ancestors, who, satisfied by his offerings, will grant him all his desires. Three things are held pure at obsequies, a daughter's son, a Nepal blanket, and sesamum-seeds; and the gift, or naming, or sight of silver is also propitious. The person offering a Śráddha should avoid anger, walking about, and hurry; these three things are very objectionable. The Viśwadevas, and paternal and maternal ancestors, and the living members of a man's family are all nourished by the offerer of ancestral oblations.