Chāndogya Upaniṣad 3.16.4

3.16.4

taṃ ced etasmin vayasi kiṃcid upatapet sa brūyāt \
prāṇā rudrā idaṃ me mādhyaṃdinaṃ savanaṃ tṛtīyasavanam anusaṃtanuteti māhaṃ prāṇānāṃ rudrāṇāṃ madhye yajño vilopsīyeti \
ud dhaiva tata ety agado ha bhavati \\316.4\

4. If any sickness should overtake him in this period of life, let him say: ‘Ye vital breaths, ye Rudras, let this mid-day libation of mine continue over to the third libation. Let not me, the sacrifice, be broken off in the midst of the vital breaths, of the Rudras.’ He arises from it; he becomes free from sickness.