Bhagavatapurana 4.1.20

4.1.20

śaraṇaṃ taṃ prapadye 'haṃ ya eva jagad-īśvaraḥ /
prajām ātma-samāṃ mahyaṃ prayacchatv iti cintayan //

18—20. On that mountain covered with the forests of the Palāsa and the Asoka (adorned) with clusters of flowers, and resounding on all sides with the water-falls of the Nirvindhyā, the sage controlled his mind by means of Prānāyāma and for a century stood on one foot defying cold and heat and subsisting upon air, and contemplating the Lord thus: "I take refuge with Hari who is the supreme ruler of the Universe. May He be pleased to bestow upon me a son worthy of myself."