Shiva Purana

siva.sh/siva-purana/vishweshwara-samhita/17/131

पूजया शिवभक्तस्य शिवः प्रीततरो भवेत् । शिवस्य शिवभक्तस्य भेदो नास्ति शिवो हि सः १३१ ।

sanskrit

Śiva becomes delighted at the worship of the devotee. There is no difference between Śiva and the devotee of Śiva. He is Śiva Himself.

english translation

pUjayA zivabhaktasya zivaH prItataro bhavet | zivasya zivabhaktasya bhedo nAsti zivo hi saH 131 |

hk transliteration by Sanscript