The Compendium of Caraka 4.6.28_7

4.6.28_7

yasya ceṣṭaṃ yo yadā mriyate sa tasya mṛtyukāla iti, tasya sarve bhāvā yathāsvaṃ niyatakālā bhaviṣyanti; tacca nopapadyate, pratyakṣaṃ hyakālāhāravacanakarmaṇāṃ phalamaniṣṭaṃ, viparyaye ceṣṭaṃ; pratyakṣataścopalabhyate khalu kālākālavyaktistāsu tāsvavasthāsu taṃ tamarthamabhisamīkṣya, tadyathā---kālo 'ayamasya vyadherāhārasyauṣadhasya pratikarmaṇo visargasya, akālo veti/

And for one by whom it is held that whenever one dies, that is one's time of death, all entities would have their own fixed time; and that is not admissible, for the undesirable fruit of untimely food, speech, and action is directly observed, and in the contrary case, the desirable; and the manifestation of timeliness and untimeliness is directly perceived in various conditions after considering each particular purpose, such as: 'this is the time, or not the time, for this disease, for food, for medicine, for counter-treatment, for evacuation.'