Shiva Purana
मन्त्राष्टशतपूतेन जलेन शुचिना व्रती ॥ स्नायान्नदीनदोत्थेन प्रोक्षयेद्वाथ शक्तितः ॥ २१ ॥
He shall take bath in the water from east-flowing or west-flowing rivers and purify himself by repeating hundred and eight mantras or sprinkle himself as strength permits him.
english translation
mantrASTazatapUtena jalena zucinA vratI ॥ snAyAnnadInadotthena prokSayedvAtha zaktitaH ॥ 21 ॥
hk transliteration by Sanscript