Shiva Purana
तपांसि विविधान्येव जपाश्चैवाप्य नेकशः ॥ नैतेन समतां यान्ति शिवरात्रिव्रतेन च ॥ १००॥
He performed various austerities and chanted many mantras They do not attain equality with this and with the Shivaratri vow.
english translation
tapAMsi vividhAnyeva japAzcaivApya nekazaH ॥ naitena samatAM yAnti zivarAtrivratena ca ॥ 100॥
hk transliteration by Sanscript