Charak Samhita
भूतैश्चतुर्भिः सहितः सुसूक्ष्मैर्मनोजवो देहमुपैति देहात्। कर्मात्मकत्वान्न तु तस्य दृश्यं दिव्यं विना दर्शनमस्ति रूपम् ॥३१॥
The soul, along with four subtle bhutas, at a speed like that of the mind, transmigrates from one body to the other according to past deeds. It cannot be seen without divine visual sense.
english translation
bhUtaizcaturbhiH sahitaH susUkSmairmanojavo dehamupaiti dehAt। karmAtmakatvAnna tu tasya dRzyaM divyaM vinA darzanamasti rUpam ॥31॥
hk transliteration by Sanscript