Muwatta Malik:Burials:Hadith 570
حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ عَبْدِ الرَّحْمَنِ بْنِ الْقَاسِمِ بْنِ مُحَمَّدِ بْنِ أَبِي بَكْرٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏ "‏ لِيُعَزِّ الْمُسْلِمِينَ فِي مَصَائِبِهِمُ الْمُصِيبَةُ بِي ‏"‏ ‏.‏

Yahya related to me from Malik from Abd ar-Rahman ibn al-Qasim ibn Muhammad ibn Abi Bakr that the Messenger of Allah, may Allah bless him and grant him peace, said, “Let the misfortune that befalls me be a comfort to the Muslims in their misfortunes.”