Sunan Abu Dawud
4207
Sahih+3

This version adds (to the previous hadith No 4194):My father said to him (the Prophet): Show me what is on your back, for I am a physician. He (the Prophet) said: You are only a soother. Its physician is He Who has created it

SahihAl-Albani
SahihMuhammad Muhyi Al-Din Abdul Hamid