Hazrat Ali (radhiyallahu ‘anhu) reports:
On one occasion, I fell sick, and while I was sick, Rasulullah (sallallahu ‘alaihi wasallam) came to visit me. When Rasulullah (sallallahu ‘alaihi wasallam) entered my home, I was lying down. Seeing me lying down, Rasulullah (sallallahu ‘alaihi wasallam) came close to my side and then took his clothing and used it to cover me. Thereafter, on seeing my weakness, Rasulullah (sallallahu ‘alaihi wasallam) stood, went to the musjid and performed some nafl salaah to beseech Allah Ta‘ala to bless me with shifaa.
After completing the salaah, Rasulullah (sallallahu ‘alaihi wasallam) returned, lifted the clothing from me and addressed me saying, “Stand up, O the son of Abu Taalib, for you have been cured!” I thus stood, and I found myself to be completely cured. I found myself in such a state that there was no sign of illness or weakness in my body.
Rasulullah (sallallahu ‘alaihi wasallam) then said, “Whenever I made du‘aa to Allah Ta‘ala, He accepted my du‘aa. On this occasion, when I made du‘aa, then I made special du‘aa for myself and for you, and whatever I asked for myself, I also asked for you, (including your shifaa).” (Fazaa’il-ul-Khulafaa li-Abi Nu’aim #78)
From this incident, we see the great love that Rasulullah (sallallahu ‘alaihi wasallam) had for Hazrat Ali (radhiyallahu ‘anhu). Similarly, we understand that Rasulullah (sallallahu ‘alaihi wasallam) had taught us, through his mubaarak action, that when we fall ill, then we should turn to Allah Ta‘ala in du‘aa, begging Him for shifaa, as everything lies in the control and power of Allah Ta‘ala.