Sahih Muslim 2999
Sahih Muslim · Book 55: The Book of Zuhd and Softening of Hearts · The Believer's Affair Is All Good
Suhaib reported that Allah's Messenger (ﷺ) said:
حَدَّثَنَا هَدَّابُ بْنُ خَالِدٍ الأَزْدِيُّ ، وَشَيْبَانُ بْنُ فَرُّوخَ ، جَمِيعًا عَنْ سُلَيْمَانَ بْنِ الْمُغِيرَةِ ، - وَاللَّفْظُ لِشَيْبَانَ - حَدَّثَنَا سُلَيْمَانُ، حَدَّثَنَا ثَابِتٌ ، عَنْ عَبْدِ الرَّحْمَنِ بْنِ أَبِي لَيْلَى ، عَنْ صُهَيْبٍ ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " عَجَبًا لأَمْرِ الْمُؤْمِنِ إِنَّ أَمْرَهُ كُلَّهُ خَيْرٌ وَلَيْسَ ذَاكَ لأَحَدٍ إِلاَّ لِلْمُؤْمِنِ إِنْ أَصَابَتْهُ سَرَّاءُ شَكَرَ فَكَانَ خَيْرًا لَهُ وَإِنْ أَصَابَتْهُ ضَرَّاءُ صَبَرَ فَكَانَ خَيْرًا لَهُ " .
Strange are the ways of a believer for there is good in every affair of his and this is not the case with anyone else except in the case of a believer for if he has an occasion to feel delight, he thanks (God), thus there is a good for him in it, and if he gets into trouble and shows resignation (and endures it patiently), there is a good for him in it.