The Compendium of Caraka 3.8.43

3.8.43

atha saṃśayaḥ---saṃśayo nāma *sandehalakṣaṇānusandigdheṣvartheṣvaniścayaḥ; yathā---dṛṣṭā hyāyuṣmallakṣaṇairupetāścānupetāśca tathā sakriyāścākriyāśca puruṣāḥ śīghrabhaṅgāścirajīvinaśca, etadubhayadṛṣṭatvāt saṃśayaḥ---kimasti khalvakālamṛtyuruta nāstīti//

Now, doubt: doubt is irresolution regarding matters that are accompanied by signs causing uncertainty; for instance, seeing persons endowed with the marks of longevity and not endowed with them, as well as those receiving treatment and not receiving treatment, perishing quickly or living long, because both are seen there is doubt: 'Does untimely death really exist or does it not?'