Adhyaya 89: शौचाचारलक्षणम् — सदाचार, भैक्ष्यचर्या, प्रायश्चित्त, द्रव्यशुद्धि, आशौच-निर्णय
सुप्त्वा भुक्त्वा च वै विप्राः क्षुत्त्वा पीत्वा च वै तथा ष्ठीवित्वाध्ययनादौ च शुचिरप्याचमेत्पुनः
suptvā bhuktvā ca vai viprāḥ kṣuttvā pītvā ca vai tathā ṣṭhīvitvādhyayanādau ca śucirapyācametpunaḥ
يا أيها البراهمة، بعد النوم وبعد الأكل، وبعد العطاس وكذلك بعد الشرب، وبعد البصق—وكذلك عند بدء تلاوة الفيدا وما شابهها—ينبغي أن يُعاد فعل الآچَمَنَة (تطهير الفم بالماء)، وإن كان المرء طاهرًا في سائر أحواله.
Suta Goswami (narrating dharma and ritual purity norms to the sages of Naimisharanya)
It sets a purity protocol: even minor bodily interruptions (sleep, food, sneeze, drink, spit) require ācamana so the worshipper approaches the Linga with renewed shauca, supporting mantra-śakti and ritual correctness.
By implication, Shiva as Pati is approached through disciplined purity; the devotee (pashu) reduces pasha-like impurities (mala and ritual doṣa) via regulated conduct, making the mind fit for Śiva-mantra and Śiva-arcana.
Ācamana as a recurring purificatory act before adhyayana and sacred actions—an outer shauca that steadies inner focus, aligning with Shaiva sadhana where bodily regulation supports mantra-japa and puja.