Skandapurana 17.12.16

17.12.16

māsāṃte'para pakṣe tu kṣayāhe pitṛmātṛke ..
gajacchāyāṃ trayodaśyāṃ dravye prāptau dvijottamaḥ .. 16 ..

at the end of the month, during the dark fortnight, on the death anniversary of father or mother, / during the elephant's shadow, on the thirteenth day, or when wealth is obtained, O best of the twice-born.