حَدَّثَنَا مُحَمَّدُ بْنُ رُمْحٍ، أَنْبَأَنَا اللَّيْثُ بْنُ سَعْدٍ، عَنْ يَزِيدَ بْنِ أَبِي حَبِيبٍ، عَنْ سَعْدِ بْنِ سِنَانٍ، عَنْ أَنَسِ بْنِ مَالِكٍ، عَنْ رَسُولِ اللَّهِ ـ صلى الله عليه وسلم ـ أَنَّهُ قَالَ ‏"‏ عِظَمُ الْجَزَاءِ مَعَ عِظَمِ الْبَلاَءِ وَإِنَّ اللَّهَ إِذَا أَحَبَّ قَوْمًا ابْتَلاَهُمْ فَمَنْ رَضِيَ فَلَهُ الرِّضَا وَمَنْ سَخِطَ فَلَهُ السُّخْطُ ‏"‏ ‏.‏

It was narrated from Anas bin Malik that the Messenger of Allah (PBUH)said: “The greatest reward comes with the greatest trial. WhenAllahloves a people He tests them. Whoever accepts that wins Hispleasurebut whoever is discontent with that earns His wrath.” Translation Not Available

Book Ref: Sunan Ibn Majah Book 36 Hadith 4031
Web Ref:  Sunan Ibn Majah Vol 5 Book 36 Hadith 4031