उमामहेश्वरव्रतं—पञ्चाक्षरमन्त्रस्य माहात्म्यं, न्यासः, जपविधिः, सदाचारः, विनियोगः
तच्चाण्डालसमं ज्ञेयं नात्र कार्या विचारणा स्फिग्वातं शूर्पवातं च वातं प्राणमुखानिलम्
taccāṇḍālasamaṃ jñeyaṃ nātra kāryā vicāraṇā sphigvātaṃ śūrpavātaṃ ca vātaṃ prāṇamukhānilam
Considera impuro como un paria el viento del cuerpo, el del aventador y el aliento que sale de la boca.
Suta Goswami (narrating normative rules within the Linga Purana discourse)
It sets a strict śauca (purity) standard for Śiva-pūjā, declaring certain bodily and environmental airs as highly polluting, so the worshipper avoids doṣa while approaching the Liṅga.
Indirectly, it implies Śiva as Pati (the supremely pure Lord) who is approached through disciplined conduct; the pashu (bound soul) must reduce pasha-like impurities and distractions to become fit for worship and grace.
A practical niyama of śauca and prāṇa-restraint: controlling breath and avoiding contaminating airs around the altar, aligning bodily discipline with the inner purity expected in Pāśupata-oriented Śiva practice.