Adhyaya 89: शौचाचारलक्षणम् — सदाचार, भैक्ष्यचर्या, प्रायश्चित्त, द्रव्यशुद्धि, आशौच-निर्णय
एकाहाद् यज्ञयाजिनां शुद्धिरुक्ता स्वयंभुवा ततस्त्वधीतशाखानां चतुर्भिः सर्वदेहिनाम्
ekāhād yajñayājināṃ śuddhiruktā svayaṃbhuvā tatastvadhītaśākhānāṃ caturbhiḥ sarvadehinām
スヴァヤンブー(梵天)は、供犠(ヤジュニャ)を執り行う者は一日で清浄になると説いた。その後は、あらゆる有身の者—とりわけヴェーダの諸学派(シャーカー)を学んだ者—は四日で清浄を得る。
Suta Goswami (narrating Purāṇic injunctions, attributed to Svayambhū/Brahmā)
It sets a baseline of ritual purity (śuddhi/śauca) as a prerequisite for valid worship and offerings, supporting disciplined approach to Shiva-puja where the Pashu (soul) prepares itself to approach Pati (Shiva).
Indirectly: it implies Shiva-puja is approached through dharmic order—purity and restraint—so the bound soul (Pashu) reduces Pāśa (impurity/limitations) and becomes fit for communion with the transcendent Pati.
Śauca (purificatory discipline) tied to Vedic practice—especially for yajña-performers and Veda-students—serving as a preparatory limb for Shiva worship and for higher Pāśupata-oriented sādhanā.