O scion of Bharata, after Svāyambhuva Manu had thus entered the forest with his wife, he stood on one leg on the bank of the river Sunandā, and in this way, with only one leg touching the earth, he performed great austerities for one hundred years. While performing these austerities, he spoke as follows.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
सुनन्दायां वर्षशतं पदैकेन भुवं स्पृशन् । तप्यमानस्तपो घोरमिदमन्वाह भारत
sunandāyāṃ varṣaśataṃ padaikena bhuvaṃ spṛśan | tapyamānastapo ghoramidamanvāha bhārata
SB 8.1.8