Shiva Purana
प्रधानं कारणं योगो विमुक्तेर्मुनिसत्तम ॥ क्रियायोगस्तु योगस्य परमन्ध्येयसाधनम् ॥ ११॥
O excellent sage, the chief reason of liberation is the Yoga. Kriyāyoga is the greatest means of liberation.
english translation
pradhAnaM kAraNaM yogo vimuktermunisattama ॥ kriyAyogastu yogasya paramandhyeyasAdhanam ॥ 11॥
hk transliteration by Sanscript