Shiva Purana
ततः स्तोत्रमुपास्यान्ते त्वष्टोत्तरशतावराम् ॥ जपेत्पञ्चाक्षरीं विद्यां सहस्रोत्तरमुत्सुकः ॥ ८६ ॥
After the eulogy he shall perform the Japa of the five-syllabled mantra not less than hundred and eight times. An eager devotee shall perform the Japa more than a thousand times.
english translation
tataH stotramupAsyAnte tvaSTottarazatAvarAm ॥ japetpaJcAkSarIM vidyAM sahasrottaramutsukaH ॥ 86 ॥
hk transliteration by Sanscript