Shiva Purana
एकपादतलेनैव तिष्ठन्मुनिवरो यथा ॥ सूर्य्ये दृष्टिं निबध्यैकां मंत्रमावर्तयन्स्थितः ॥ २॥
Like a great sage, he stood on the sole of a single foot. He fixed one of his eyes at the sun and stood repeating the mantra.
english translation
ekapAdatalenaiva tiSThanmunivaro yathA ॥ sUryye dRSTiM nibadhyaikAM maMtramAvartayansthitaH ॥ 2॥
hk transliteration by Sanscript