Yogacūḍāmaṇi Upaniṣad 94

Yogacūḍāmaṇyupaniṣad 94

śuddhimeti yadā sarvaṃ nāḍīcakraṃ malākulam |
tadaiva jāyate yogī prāṇasaṃgrahaṇakṣamaḥ ||