Bhagavatapurana 8.4.8

8.4.8

sa ekadārādhanakāla ātmavān gṛhītamaunavrata īśvaraṃ harim /
jaṭādharastāpasa āpluto 'cyutaṃ samarcayāmāsa kulācalāśramaḥ //

8. Once while in his hermitage on the Kulachala he had controlled his mind, worn matted hair, and undertaken the vow of silence and having bathed at the proper hour of worship he worshipped the imperishable Hari, the Ruler of Rulers.