Shiva Purana
तत्र संपूजयेद्भानुं स्वकीयावरणैः सह ॥ स्वखोल्कायेति मंत्रेण सांगतस्सुखसिद्धये ॥ २३ ॥
There he shall worship the sun with the covers along with his ancillaries repeating the mantra “Khakholkāya” for securing happiness.
english translation
tatra saMpUjayedbhAnuM svakIyAvaraNaiH saha ॥ svakholkAyeti maMtreNa sAMgatassukhasiddhaye ॥ 23 ॥
hk transliteration by Sanscript