Shiva Purana
अनन्यया च भक्त्या वै युक्तः शम्भुं भजेत्पुनः ॥ अन्ते च मुक्तिमायाति नात्र कार्या विचारणा ॥ ३६॥
He shall worship Śiva with unflinching and exclusive devotion. Salvation is the result. There is nothing to be doubtful about this.
english translation
ananyayA ca bhaktyA vai yuktaH zambhuM bhajetpunaH ॥ ante ca muktimAyAti nAtra kAryA vicAraNA ॥ 36॥
hk transliteration by Sanscript