Pitṛgaṇa-Vibhāga (Classification of the Pitṛs) and the Śrāddha–Soma Nourishment Cycle
पितॄन्प्रीणाति यो वंश्यः पितरः प्रीणयन्ति तम् / पितरः पुष्टिकामस्य प्रजाकामस्य वा पुनः
pitṝnprīṇāti yo vaṃśyaḥ pitaraḥ prīṇayanti tam / pitaraḥ puṣṭikāmasya prajākāmasya vā punaḥ
The descendant who gladdens the Pitṛs is gladdened by the Pitṛs in return—especially one who seeks nourishment and prosperity, or again one who longs for progeny.