Shiva Purana
शैवं नाम यथा गंगा विभूतिर्यमुना मता । रुद्रा क्षं विधिना प्रोक्ता सर्वपापाविनाशिनी १४ ।
As said by Brahmā, Śiva’s name is on a par with Gaṅgā, the ash is equal to Yamunā and Rudrākṣa destroys all sins (and is equal to Sarasvatī).
english translation
zaivaM nAma yathA gaMgA vibhUtiryamunA matA । rudrA kSaM vidhinA proktA sarvapApAvinAzinI 14 ।
hk transliteration by Sanscript