Yogacūḍāmaṇi Upaniṣad 93

Yogacūḍāmaṇyupaniṣad 93

ṣaḍviṃśadaṅgulirhaṃsaḥ prayāṇaṃ kurute bahiḥ |
vāmadakṣiṇamārgeṇa prāṇāyāmo vidhīyate ||