Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
suyuti:23696a –
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السيوطي:٢٣٦٩٦a –

"مَوْتُ الْفَجْأَة رَاحَةٌ للْمُؤْمِنِ، وَأَخْذَةُ أَسِفٍ للْفَاجِرِ".  

[حم] أحمد [ق] البيهقى في السنن عن عائشة

See similar narrations below:

Collected by Aḥmad, Suyūṭī
ahmad:25042 – Wakīʿ > ʿUbaydullāh b. al-Walīd > ʿAbdullāh b. ʿUbayd b. ʿUmayr > ʿĀʾishah

[Machine] I asked the Messenger of Allah ﷺ about sudden death. He said, "It brings tranquility to the believer and sorrow to the sinner."  

أحمد:٢٥٠٤٢ – حَدَّثَنَا وَكِيعٌ حَدَّثَنَا عُبَيْدُ اللهِ بْنُ الْوَلِيدِ عَنْ عَبْدِ اللهِ بْنِ عُبَيْدِ بْنِ عُمَيْرٍ عَنْ عَائِشَةَ قَالَتْ

سَأَلْتُ رَسُولَ اللهِ ﷺ عَنْ مَوْتِ الْفَجْأَةِ؟ فَقَالَ رَاحَةٌ لِلْمُؤْمِنِ وَأَخْذَةُ أَسَفٍ لِلْفَاجِرِ  

suyuti:14304a –
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السيوطي:١٤٣٠٤a –

"رَاحَةٌ لِلمُؤمِنِ، وَأَخْذَةُ أَسَف عَلَى الفاجرِ".  

[حم] أحمد [طس] الطبرانى في الأوسط عن عائشة قالت: سَأَلت رسول اللَّه ﷺ عن موت الفُجَاءَةِ فقال: "راحة وذكره" وسنده ضعيف