Shloka 13
दानपात्रापात्र-निर्णयः / Determining Worthy Gifts, Recipients, and Permissible Food
मार्कण्डेयमुखात् कृत्स्नं यतिधर्ममवाप्तवान् । रामादस्त्राणि शक्राच्च प्राप्तवान् पुरुषर्षभ:
mārkaṇḍeyamukhāt kṛtsnaṃ yatidharmaṃ avāptavān | rāmāt astrāṇi śakrācca prāptavān puruṣarṣabhaḥ ||
毗湿摩耶那说道：人中雄牛毗湿摩从摩尔坎德耶之口尽得一切出家行者之法（游行者之法度）；又从罗摩（帕罗修罗摩）与释迦罗（因陀罗）受习诸般兵器之术。
वैशम्पायन उवाच
Educational Q&A
True authority in dharma-discourse is grounded in comprehensive ethical discipline (yatidharmānuśāsana) as well as practical competence; Bhīṣma’s guidance is validated by learning from a great ṛṣi (Mārkaṇḍeya) and by mastery of martial knowledge from eminent teachers (Paraśurāma and Indra).
Vaiśampāyana is describing Bhīṣma’s qualifications: he acquired complete knowledge of ascetic conduct from sage Mārkaṇḍeya and received weapon-instruction from Paraśurāma and Indra, establishing why Bhīṣma is fit to instruct Yudhiṣṭhira on dharma in the Śānti Parva.