Shiva Purana
कनिष्ठामादितः कृत्वा यावदंगुष्ठकं प्रिये ॥ पर्वत्रयक्रमेणैव हस्तयोरुभयोरपि ॥ ३३॥
Start with the youngest and reach to the thumb, dear. In the order of the three mountains on both hands.
english translation
kaniSThAmAditaH kRtvA yAvadaMguSThakaM priye ॥ parvatrayakrameNaiva hastayorubhayorapi ॥ 33॥
hk transliteration by Sanscript