Pitṛgaṇa-Vibhāga (Classification of the Pitṛs) and the Śrāddha–Soma Nourishment Cycle
पितॄणामानुपूर्व्येण सर्वेषां द्विजसत्तमाः / तस्मादेतत्स्वधर्मेण देयं श्राद्धं च श्रद्धया
pitṝṇāmānupūrvyeṇa sarveṣāṃ dvijasattamāḥ / tasmādetatsvadharmeṇa deyaṃ śrāddhaṃ ca śraddhayā
O best of the twice-born! In the due succession of all the ancestors; therefore, according to one’s own dharma, Śrāddha should be offered with reverent faith.