Shiva Purana
दक्षहस्तस्थितांगुष्ठं समारभ्य यथाक्रमम् ॥ वामहस्तकनिष्ठांतं विन्यसेत्पूर्ववत्क्रमात् ॥ ६४ ॥
He shall perform the Nyāsa starting with the thumb of the right hand and ending with the little finger of the left hand.
english translation
dakSahastasthitAMguSThaM samArabhya yathAkramam ॥ vAmahastakaniSThAMtaM vinyasetpUrvavatkramAt ॥ 64 ॥
hk transliteration by Sanscript