Chāndogya Upaniṣad 3.16.2

3.16.2

taṃ ced etasmin vayasi kiṃcid upatapet sa brūyāt \
prāṇā vasava idaṃ me prātaḥsavanaṃ mādhyaṃdinaṃ savanam anusaṃtanuteti mā ahaṃ prāṇānāṃ vasūnāṃ madhye yajño vilopsīyeti \
ud dhaiva tata ety agado ha bhavati \\316.2\

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