Shiva Purana
उपचारैः षोडशभिः पूजया शिवयोगिनाम् । सालोक्यादिक्रमेणैव शुद्धो मुक्तिं लभेन्नरः ३१ ।
A pure man shall obtain liberation only step by step, beginning with Sālokya as a result of being purified by the worship of Śivayogins with sixteen services and homage.
english translation
upacAraiH SoDazabhiH pUjayA zivayoginAm । sAlokyAdikrameNaiva zuddho muktiM labhennaraH 31 ।
hk transliteration by Sanscript