Shiva Purana
यत्फलं मम पूजायां वर्षमेकं निरंतरम् । तत्फलं लभते सद्यः शिवरात्रौ मदर्चनात् १३ ।
By the worship on Śivarātrī day the devotee attains that fruit which usually accrues to one who continuously worships me for a year.
english translation
yatphalaM mama pUjAyAM varSamekaM niraMtaram । tatphalaM labhate sadyaH zivarAtrau madarcanAt 13 ।
hk transliteration by Sanscript