Abu Hurayrah (رضي الله عنه) narrated that the Messenger of Allah (صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ) said:

“Whoever sees an afflicted person then says: ‘All praise is due to Allah Who has saved me from that which He has afflicted you with and blessed me greatly over many of those whom He has created’, shall not be struck by that affliction.” (Jāmi at-Tirmidhī no. 3432, Al-Albānī: Sahīh)

Notes from Tuhfat al-Ahwadhi, Explanation of Jami’ at-Tirmidhi (9/391):

• Should be said when seeing a person with a bodily affliction (illness, disability etc.) or religious related affliction such as wrongdoing, oppression, innovation, disbelief and other than it.

• Should be said in a low voice when seeing a person with a bodily affliction so as to not upset them.

• The person afflicted in his religion (sins, innovation etc.) should be made to hear it if one wishes to rebuke him and it is hoped that he will rectify himself. However, if it is feared that it may cause harm or a greater evil then it should be said in a low voice.