WE RELATE FROM the book of at-Tirmidhī that Abū Hurayrah 
related that the Messenger of Allah 
said: “Whoever sees an afflicted person and says: ‘Praise be to Allah, Who has protected me from that with which He has afflicted you, and has favoured me greatly over many of those whom He created’ will not suffer from the same affliction.” [1].At-Tirmidhī describes this hadith as ḥasan.
related that the Messenger of Allah said: “Whoever sees an afflicted person and says: ‘Praise be to Allah, Who has protected me from that with which He has afflicted you, and has favoured me greatly over many of those whom He created’ will not suffer from the same affliction.” [1].At-Tirmidhī describes this hadith as ḥasan.
Al-ḥamdu li-llāhi-lladhī ‘āfānī mim-ma-btalāka bihi wa faḍḍalanī ‘alā kathīrin mimman khalaqa tafḍīlā.
We relate in the Book of at-Tirmidhī that ‘Umar ibn al-Khaṭṭāb reported that the Messenger of Allah said: “Whoever sees an afflicted person and says: ‘Praise be to Allah, Who has protected me from that with which He has afflicted you, and has favoured me greatly over many of those whom He created’ will not be affected by that calamity, whatever it may be, as long as he lives.” [2].At-Tirmidhī considered the isnād weak.
reported that the Messenger of Allah said: “Whoever sees an afflicted person and says: ‘Praise be to Allah, Who has protected me from that with which He has afflicted you, and has favoured me greatly over many of those whom He created’ will not be affected by that calamity, whatever it may be, as long as he lives.” [2].At-Tirmidhī considered the isnād weak.I say that the ‘ulamā’ hold that it is essential to say this dhikr softly so that one can hear oneself but the person who is afflicted does not hear and his heart may not be pained by it. If, however, the affliction is a sin, there is no harm in making him hear it, if one does not fear trouble. And Allah knows best.
References
[1] At-Tirmidhī (3428), who states that this hadith is ḥasan gharīb by this line of narration.
[2] At-Tirmidhī (3427), who states that this hadith is gharīb.