Shraddhamanjari (Bapubhatta Kelakara) 6.1.23

6.1.23

taccādhimāsamṛtānāṃ prathamābdikaṃ trayodaśe māse kāryam | madhye yadyadhimāso bhavettadā ca trayodaśe māse kāryam | yadyante'dhimāsastadā tasminnevādhimāse kāryam
dvitīyādivārṣikaṃ tu śuddhamāsa eva | adhimāsamṛtānāṃ tu yadā sa
eva māso'dhikaḥ syāttadā tatraivādhimāse kāryam | darśe vārṣikaṃ cettadā
pūrvaṃ vārṣikaṃ kṛtvā tataḥ piṇḍapitṛyajño darśaśrāddhaṃ ceti nirṇayadīpe
smṛtisāre ca krama uktaḥ | kamalākareṇa tu piṇḍapitṛyajñānantaraṃ vārṣikaṃ
kṛtvā tato darśaśrāddhaṃ kartavyamiti siddhāntitam | tatpakṣe nātra vyatiṣaṅgo bhavati | pravāsamaraṇādinā kṣayāhatitherajñāne tanmāsasya kṛṣṇāṣṭamyāṃ kṛṣṇaikādaśyāmamāvāsyāyāṃ śuklaukādaśyāṃ vā kāryam | yadi
tithurvijñātā māso na vijñātastadā mārgaśīrṣe māghe bhādrapade āṣāḍhe
vā tattithau kāryam | tithimāsayoravijñāne māghe mārge vā'māvāsyāyāṃ
kāryam | athavā prasthānamāsadivasau grāhyau | tayorapi titherajñāne
prasthānamāsadarśa kāryam | titherjñāne māsājñāne tu mārgaśīrṣādau | ubhayasyāpyavijñāne mṛtavārtāśravaṇakālikau tithimāsau grāhyau | tayoranyatarājñāne prasthānadinegāsavanirṇayaḥ | etayorapyavijñāne mārgadarśa kāryam
idaṃ cā''bdikaṃ karturbhāryāyāṃ rajasvalāyāṃ satyāmapi sapiṇḍarumantraineva
kāryam | evaṃ garbhiṇyāmapi | mṛtasya bhāryāyāṃ rajasvalāyāmapi tathaiva
sā yadyaputrakasya bhartuḥ śrāddhakartrī cettadā pañcame'hni kuryāt | āśīce