Srimad-Bhagavatam: Canto 4 - Chapter 1 - Verse 19
Sanskrit:
प्राणायामेन संयम्य मनो वर्षशतं मुनि: ।अतिष्ठदेकपादेन निर्द्वन्द्वोऽनिलभोजन: ॥ १९ ॥
ITRANS:
prāṇāyāmena saṁyamyamano varṣa-śataṁ muniḥatiṣṭhad eka-pādenanirdvandvo ’nila-bhojanaḥ
Translation:
There the great sage concentrated his mind by the yogic breathing exercises, and thereby controlling all attachment, he remained standing on one leg only, eating nothing but air, and stood there on one leg for one hundred years.