Shiva Purana
स्नात्वा द्विगुणमभ्यर्च्य देवं देवीमुपोष्य च ॥ शिवस्यायुतमभ्यस्येद्ब्रह्मचर्यपुरस्सरम् ॥ ७१ ॥
After bathing, he worshiped Lord Śiva twice as much and observed a fast. One should practice the ten thousand mantras of Lord Śiva followed by celibacy.
english translation
snAtvA dviguNamabhyarcya devaM devImupoSya ca ॥ zivasyAyutamabhyasyedbrahmacaryapurassaram ॥ 71 ॥
hk transliteration by Sanscript