Adhyaya 89: शौचाचारलक्षणम् — सदाचार, भैक्ष्यचर्या, प्रायश्चित्त, द्रव्यशुद्धि, आशौच-निर्णय
देवद्रोहं गुरुद्रोहं न कुर्यात्सर्वयत्नतः कृत्वा प्रमादतो विप्राः प्रणवस्यायुतं जपेत्
devadrohaṃ gurudrohaṃ na kuryātsarvayatnataḥ kṛtvā pramādato viprāḥ praṇavasyāyutaṃ japet
あらゆる努力をもって、デーヴァたちへの背信も、師(グル)への背信も決して行ってはならない。もし不注意によってその罪を犯したなら、ああブラーフマナたちよ、贖いとしてプラナヴァ(Oṁ)を一万遍唱えよ。
Suta Goswami (narrating puranic instruction to the sages; internal source framed as dharma-teaching)
It safeguards Linga-pūjā by stressing aparādha-avoidance—betraying Devas or the Guru undermines mantra-adhikāra; Praṇava-japa is prescribed as a purificatory remedy to restore ritual fitness.
By elevating the Praṇava (Oṁ)—a primary marker of the Supreme (Pati)—as the expiatory support, it implies that returning to the foundational vibration of Shiva-tattva purifies the pashu (soul) from pasha (bondage) created by offence and negligence.
Mantra-japa of the Praṇava (Oṁ), specifically ten thousand repetitions, as prāyaścitta—an inner purification practice aligned with Shaiva discipline and preparatory to stable pūjā and yogic steadiness.