Karshnajinismriti 1.5: Vīramitrodaya · Śrāddhacandrikā (Divākarabhaṭṭa) · Bhagavantabhāskara +2

1.5

śrāddhaṃ naivaikavargasya trayodaśyām upakramet | na tṛptās tatra ye yasya prajāṃ hiṃsanti tasya te

One should never begin a śrāddha on the thirteenth lunar day for a single class [of ancestors]; / those among them who are not gratified there injure the offspring of that [sacrificer].

One should not begin a śrāddha for one group (of ancestors) on the thirteenth: those not satisfied there harm the offspring of him whose (ancestors) they are.