Mahabharata — Anushasana Parva, Shloka 20
विषयस्थ: शरीरेषु स मृत्यु: प्राणिनामिह । स च वायु: शरीरेषु प्राणापानशरीरिणाम्,वे प्राणियोंके शरीरोंमें रहनेवाले और उनके मृत्युरूप हैं तथा वे ही प्राण-अपान आदि वायुके रूपसे देहके भीतर निवास करते हैं
viṣayasthaḥ śarīreṣu sa mṛtyuḥ prāṇinām iha | sa ca vāyuḥ śarīreṣu prāṇāpānaśarīriṇām ||
风神伐由说道：“他住于一切有身众生之内，作为在诸境（感官所缘）之间运行的力量，于此世便成为他们的死亡本身。而同一原理，在身中即为风（Vāyu），以普拉那（prāṇa）与阿帕那（apāna）（以及其他诸命风）之形，居于诸有情之内。”
वायुदेव उवाच
Educational Q&A
The verse links sensory entanglement (viṣaya-stha) with mortality: when life is driven by sense-objects, the same inner force becomes ‘Death’ for embodied beings. It also teaches that the vital principle within the body is Vāyu functioning as prāṇa and apāna—highlighting the ethical need for restraint and right use of the senses to sustain life and dharma.
Vāyu-deva is speaking in Anuśāsana Parva, explaining the inner workings of embodied life: the presence of Vāyu within beings as the vital airs (prāṇa, apāna, etc.) and how, when bound up with sense-objects, that same force is described as taking the form of death for creatures in the world.