उमामहेश्वरव्रतं—पञ्चाक्षरमन्त्रस्य माहात्म्यं, न्यासः, जपविधिः, सदाचारः, विनियोगः
आस्येन न पिबेत्तोयं तिष्ठन्नञ्जलिनापि वा वामहस्तेन शय्यायां तथैवान्यंकरेण वा
āsyena na pibettoyaṃ tiṣṭhannañjalināpi vā vāmahastena śayyāyāṃ tathaivānyaṃkareṇa vā
水を口で直接すすってはならない。立ったまま、たとえ両手で掬っても飲んではならない。左手で飲んではならず、床に臥しても飲んではならず、また同様に不作法な仕方で他の手でも飲んではならない。この戒めはシヴァ礼拝の清浄を支え、パシュ(個我)をパティ(主)へと安定させる。
Sūta Gosvāmin (narrating Purāṇic injunctions to the sages of Naimiṣāraṇya)
It teaches śauca (ritual purity) and disciplined ācāra—avoiding careless ways of drinking water—so the devotee approaches the Liṅga with reverence, restraint, and fitness for pūjā.
By implication, Śiva-tattva is approached through niyama and purity: when the pashu governs bodily habits and reduces rajas/tamas, the mind becomes steadier for turning toward the Pati, Śiva.
Pūjā-vidhi and ācāra-niyama: bodily discipline (how one drinks water) as a supportive observance that reinforces self-control aligned with Pāśupata-oriented purification.