Bhagavatapurana 11.6.47

11.6.47

vāta-vasanā ya ṛṣayaḥ śramaṇā ūrdhra-manthinaḥ /
brahmākhyaṃ dhāma te yānti śāntāḥ sannyāsīno 'malāḥ //

47. The Rishis who are sky-clad, who lead austere life and a life of celibacy, who have renounced everything worldly, become pure and tranquil and attain to Thy glorious state known as Brahman.