Mahabharata Anushasna Parva Chapter 31:3

Mahabharata Anushasna Parva (Dana Dharma Parva) Chapter 31:3 They who are devoted to the worship of the deities and guests and dependants, as also of the Pitris, and they who eat the remnant of the food that is offered to deities, Pitris, guests and dependants, succeed in crossing all calamities and obstacles. They who, having ignited the domestic fire, duly keep it burning and worship it with reverence and they who have duly poured libations (to the deities) in Soma-sacrifices, succeed in crossing all calamities and obstacles. They who behave as they should towards their mothers and fathers and preceptors and other seniors even as thou, O tiger among the Vrishnis, dost behave, succeed in crossing all calamities and obstacles.'—Having said these words, the celestial Rishi ceased speaking. "'Bhishma continued, "For these reasons, do thou also, O son of Kunti, always worship with reverence the deities, the Pitris, the Brahmanas, and guests arrived at thy mansion and as the consequence of such conduct thou art sure to attain to a desirable end!