Shiva Purana
पंचमुद्रा ः! प्रदर्श्याथ शिवमंत्रजपं चरेत् । शतरुद्रि यमंत्रेण जपेद्वेदविचक्षणः ३६ ।
After showing all these five Mudrās he shall perform the “Śiva Mantra॥ 51॥ Japa”. The devotee well versed in the Vedas shall recite the “Śatarudriya” mantra.
english translation
paMcamudrA H! pradarzyAtha zivamaMtrajapaM caret । zatarudri yamaMtreNa japedvedavicakSaNaH 36 ।
hk transliteration by Sanscript