Śaṅkaraon Brahma Sūtra 4.2.11
Advaita Vedānta
Sūtra
अस्यैव चोपपत्तेरेष ऊष्मा
asyaiva copapattereṣa ūṣmā
Sūtra translation
And to that same (subtle body) that warmth (belongs), on account of the proof (which observation furnishes).
To that same subtle body belongs the warmth which wc perceive in the living body by means of touch. That warmth is not felt in the body after death, while such qualities as form, colour and so on continue to be perceived; it is, on the other hand, observed as long as there is life. From this it follows that the warmth resides in something different from the body as ordinarily known. Scripture also says, ‘ He is warm if going to live, cold if going to die.’