Shloka 18
Śrāddha-dvija-parīkṣā: Paṅkti-dūṣa and Paṅkti-pāvana (श्राद्धे द्विजपरीक्षा—पङ्क्तिदूष-पङ्क्तिपावन)
कृष्णपक्षे दशम्यादौ वर्जयित्वा चतुर्दशीम् श्राद्धकर्मणि तिथ्यस्तु प्रशस्ता न तथेतरा:
bhīṣma uvāca | kṛṣṇapakṣe daśamyādau varjayitvā caturdaśīm | śrāddhakarmaṇi tithyastu praśastā na tathetarāḥ ||
ビーシュマは言った。「暗半月（kṛṣṇa-pakṣa）においては、第十日（daśamī）から新月日（amāvāsyā）に至るまでの月日は、シュラーダ（śrāddha）の儀にふさわしいとされる—ただし十四日（caturdaśī）を除く。ほかの月日（初日から九日など）は、この目的において同じほど尊ばれない。」
भीष्म उवाच
Educational Q&A
Bhishma teaches that dharma in ancestral rites includes proper timing: in the dark fortnight, śrāddha is generally recommended from Daśamī through Amāvāsyā, with Caturdaśī specifically avoided, while earlier tithis are not considered equally suitable.
Within Bhishma’s instruction on dharma and observances, he gives a practical rule about calendrical suitability for performing śrāddha, distinguishing preferred tithis from those considered less appropriate.