It is narrated on the authority of an Ansari that the Prophet (peace and blessings of Allaah be upon him) visited an injured person. The Prophet (peace and blessings of Allaah be upon him) said: Call the doctor of Bani So-and-so for this. The people called him, he came and said: O Messenger of Allah, is there any medicine for any disease? The Prophet (peace and blessings of Allaah be upon him) said: Praise be to Allaah. Allah Almighty has also made a cure for every disease that He has sent down to the earth.