Mahabharata — Shanti Parva, Shloka 35
अग्नीषोमोत्पत्तिः
Agni–Soma Origin and the Brahmāgnīṣomīya Doctrine
प्राणिनां सर्वतो वायुश्रैष्टां वर्तयते पृथक् । प्राणनाच्चैव भूतानां प्राण इत्यभिधीयते
prāṇināṁ sarvato vāyuḥ śraiṣṭhāṁ vartayate pṛthak | prāṇanāc caiva bhūtānāṁ prāṇa ity abhidhīyate ||
毗湿摩说道：“风遍行四方，分别推动众生种种殊胜的机能运作；又因它以维系呼吸与生命而使一切有情得以存活，故名‘普罗那’（Prāṇa），即生命之息。”
भीष्म उवाच
Educational Q&A
That the all-pervading Vāyu functions as the vital force (prāṇa): it animates and sustains the diverse activities of beings, so ‘prāṇa’ is named from its role in keeping creatures alive. Ethically, it points to a shared life-principle in all beings, supporting reverence and restraint.
In the Śānti Parva instruction, Bhīṣma explains a doctrinal point about the life-breath: how Vāyu operates within living beings to sustain their functions and life, clarifying why it is termed ‘prāṇa.’