Adhyaya 89: शौचाचारलक्षणम् — सदाचार, भैक्ष्यचर्या, प्रायश्चित्त, द्रव्यशुद्धि, आशौच-निर्णय
केवलं द्वादशाहेन क्षत्त्रियाणां द्विजोत्तमाः नाभिषिक्तस्य चाशौचं संप्रमादेषु वै रणे
kevalaṃ dvādaśāhena kṣattriyāṇāṃ dvijottamāḥ nābhiṣiktasya cāśaucaṃ saṃpramādeṣu vai raṇe
O best of the twice-born, for Kṣatriyas the period of aśauca (ritual impurity) is only twelve days. And for one who has not yet received abhiṣeka (royal consecration), there is no impurity when death occurs through mishap in battle.
Suta Goswami (narrating to the sages of Naimisharanya)
It sets dharmic boundaries for ritual eligibility—clarifying when a devotee (pashu) may resume Shiva-puja after death-related impurity, and noting special exceptions connected to battle.
Indirectly: Shiva-tattva is approached through disciplined observance of purity rules; the verse frames purity as a practical aid for worship, not as Shiva’s limitation—Pati remains ever pure while the pashu follows niyamas to remove pasha-like obstructions.
Ritual discipline (niyama) concerning aśauca—timelines and exceptions that affect formal acts like abhiṣeka, mantra-japa, and temple/linga service.