Sadācāra–Varṇa-lakṣaṇa and Prātaḥkṛtya
Right Conduct, Social Typologies, and Morning Purification
अथवा देवपित्रार्षतीर्थावतरणं विना । सप्त वा पंच वा त्रीन्वा गुदं संशोधयेन्मृदा
athavā devapitrārṣatīrthāvataraṇaṃ vinā | sapta vā paṃca vā trīnvā gudaṃ saṃśodhayenmṛdā
或者,即便不至于诸天、祖灵(Pitṛ)或圣仙(Ṛṣi)所系之圣水渡口(tīrtha),亦当以土净拭肛门之处:七次,或五次,或三次。
Suta Goswami
It emphasizes śauca (purity) as a supportive discipline for Shiva worship—outer cleanliness steadies the mind and senses so devotion can be offered with focus and reverence to Pati (Shiva).
Linga worship in the Vidyeśvara/Viśveśvara context is presented as a precise pūjā-vidhi; bodily purity is part of approaching Saguna Shiva’s worship-form with proper preparation and respect.
A practical rule of cleansing using earth (mṛd) when holy water is not available, indicating preparatory purification before commencing japa, dhyāna, or Linga pūjā.