It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "When one of you sees a person afflicted with a trial, he should say: 'Alhamdu lillahil-ladhi faddalani 'alayhi wa 'ala kathirin min 'ibadihi tafdila' (All praise is for Allah, who has clearly favoured me over him and over many of His servants). When he has said this, he has indeed given thanks for that blessing."
No one other than Abdullah bin Umar (may Allah have mercy on him) narrated this hadith from Suhayl bin Abi Salih (may Allah have mercy on him), and Mutarrif bin Abdullah (may Allah have mercy on him) is alone in narrating it.
Hadith Referenceالمعجم الأوسط / باب العين / 4724
Hadith Takhrij«أخرجه الطبراني فى «الصغير» برقم: 675»