Adhyaya 89: शौचाचारलक्षणम् — सदाचार, भैक्ष्यचर्या, प्रायश्चित्त, द्रव्यशुद्धि, आशौच-निर्णय
बेहविओउर् ओफ़् अ योगिन् योगिनां चैव सर्वेषां श्रेष्ठं चान्द्रायणं भवेत् एकं द्वे त्रीणि चत्वारि शक्तितो वा समाचरेत्
behaviour of a yogin yogināṃ caiva sarveṣāṃ śreṣṭhaṃ cāndrāyaṇaṃ bhavet ekaṃ dve trīṇi catvāri śaktito vā samācaret
Для йогина — и воистину среди всех йогинов — обет Чандраяны (Cāndrāyaṇa) провозглашается наивысшим. По мере сил следует совершить его один, два, три или даже четыре раза — ради внутреннего очищения, укрепляющего бхакти к Пати (Шиве) и ослабляющего паша, связывающее пашу (индивидуальную душу).
Suta Goswami (narrating the Linga Purana’s teaching to the sages at Naimisharanya)
It elevates the Cāndrāyaṇa vrata as a premier purifier for practitioners, making the worshipper fit for steady Śiva-bhakti and disciplined Linga-upāsanā by reducing impurity and strengthening restraint.
By implying Śiva as Pati—the supreme Lord—whose realization is supported by purification; the soul (pashu) approaches Śiva-tattva as bonds (pāśa) are weakened through such observances.
The Cāndrāyaṇa observance (a lunar-cycle penance/discipline) is highlighted, to be undertaken according to one’s strength, even repeatedly (up to four times) for deeper purification.