Jatukarnya 1.5: Smṛticandrikā · Nirṇayasindhu

1.5

ākāṅkṣanti sma pitaraḥ pañcamaṃ pakṣam āśritāḥ | tasmāt tatraiva dātavyaṃ dattam anyatra niṣphalam

The ancestors long for [food] waiting for the fifth fortnight; / therefore, offering must be given precisely then; what is given at another time is fruitless.

The ancestors long (for offerings) in the fifth fortnight (from Āṣāḍha); therefore one should give then; what is given elsewhere is fruitless.