Shiva Purana
भवद्भिः सेव्यतां प्रीत्या सुखं स्यादतुलं सदा ॥ सर्वदुःखं भवत्येव शिवाऽसेवात एव हि ॥ ५२ ॥
Let him be served by you with pleasure. Unequalled happiness shall always follow. It is only by not serving Śiva that miseries crop up.
english translation
bhavadbhiH sevyatAM prItyA sukhaM syAdatulaM sadA ॥ sarvaduHkhaM bhavatyeva zivA'sevAta eva hi ॥ 52 ॥
hk transliteration by Sanscript