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
ahmad:388 – Wakīʿ > Isrāʾīl > Abū Isḥāq > ʿAmr b. Maymūnʿan ʿUmar

And diseases of the heart means dying. Wakee said: And turmoil (fitnah) from which he has not repented.  

أحمد:٣٨٨ – حَدَّثَنَا وَكِيعٌ عَنْ إِسْرَائِيلَ عَنْ أَبِي إِسْحَاقَ عَنْ عَمْرِو بْنِ مَيْمُونٍعَنْ عُمَرَ

أَنَّ النَّبِيَّ ﷺ كَانَ يَتَعَوَّذُ مِنَ الْبُخْلِ وَالْجُبْنِ وَعَذَابِ الْقَبْرِ وَأَرْذَلِ الْعُمُرِ وَفِتْنَةِ الصَّدْرِ قَالَ وَكِيعٌ فِتْنَةُ الصَّدْرِ أَنْ يَمُوتَ الرَّجُلُ وَذَكَرَ وَكِيعٌ الْفِتْنَةَ لَمْ يَتُبْ مِنْهَا  

See similar narrations below:

Collected by Ibn Mājah
ibnmajah:3844 – ʿAlī b. Muḥammad > Wakīʿ > Isrāʾīl > Abū Isḥāq > ʿAmr b. Maymūn > ʿUmar

Prophet saas used to seek refuge with Allah from cowardice, miserliness, old age, the torment of the grave and the tribulation of the heart. (Da'if)(One of the narrators) Waki' said: "Meaning when a man dies in a state of tribulation (Fitnah) and does not ask Allah to forgive him."  

ابن ماجة:٣٨٤٤ – حَدَّثَنَا عَلِيُّ بْنُ مُحَمَّدٍ حَدَّثَنَا وَكِيعٌ عَنْ إِسْرَائِيلَ عَنْ أَبِي إِسْحَاقَ عَنْ عَمْرِو بْنِ مَيْمُونٍ عَنْ عُمَرَ

أَنَّ النَّبِيَّ ﷺ كَانَ يَتَعَوَّذُ مِنَ الْجُبْنِ وَالْبُخْلِ وَأَرْذَلِ الْعُمُرِ وَعَذَابِ الْقَبْرِ وَفِتْنَةِ الصَّدْرِ قَالَ وَكِيعٌ يَعْنِي الرَّجُلَ يَمُوتُ عَلَى فِتْنَةٍ لاَ يَسْتَغْفِرُ اللَّهَ مِنْهَا