Chandogya Upanishad 3.16.6

3.16.6

taṃ ced etasmin vayasi kiṃcid upatapet sa brūyāt \
prāṇā ādityā idaṃ me tṛtīyasavanam āyur anusaṃtanuteti māhaṃ prāṇānāṃ ādityānāṃ madhye yajño vilopsīyeti \
ud dhaiva tata ety agado ha+ eva bhavati \\316.6\

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