The Compendium of Caraka 4.3.13

4.3.13

asti khalu sattvamaupapādukaṃ; yajjīvaṃ spṛkśarīreṇābhisaṃbadhnāti, yasminnapagamanapuraskṛte śīlamasya vyāvartate, bhaktirviparyasyate, sarvendriyāṇyupatapyante, balaṃ hīyate, vyādhaya āpyāyyante, yasmāddhīnaḥ prāṇāñjahāti, yadindriyāṇāmabhigrāhakaṃ ca 'mana' ityabhidhīyate; tattrividhamākhyāyate---śuddhaṃ, rājasaṃ, tāmasamiti/

Indeed, there is a transmigrating mind; it connects the living entity to the body through touch, upon whose impending departure one's character changes, attachment is inverted, all the sense faculties suffer, strength diminishes, diseases increase, deprived of which one abandons the vital breaths, and which, being the grasper of the senses, is called the 'mind.' It is declared to be threefold: pure, passionate, and dark.