Abu Wa'il narrated from Hudhaifah that 'Umar said:

"Which of you remembers what the Messenger of Allahﷺ said about the Fitnah?" So Hudhaifah said: "I do." Hudhaifah said: "A man's Fitnah is in his family, his wealth, his children, and his neighbors. It is atoned for by the Salat, fasting, charity, and by commanding good and forbidding evil." 'Umar said: "I am not asking you about this. Rather, about the Fitnah that spreads like the waves of the sea." He said: "O Commander of the Believers! Between you and it is a closed door." 'Umar said: "Will it be opened or broken?" He said: "It will be broken." He said: "Then it will never be closed until the Day of Judgement."

حَدَّثَنَا مَحْمُودُ بْنُ غَيْلاَنَ، حَدَّثَنَا أَبُو دَاوُدَ، أَنْبَأَنَا شُعْبَةُ، عَنِ الأَعْمَشِ، وَحَمَّادٍ، وَعَاصِمِ بْنِ بَهْدَلَةَ، سَمِعُوا أَبَا وَائِلٍ، عَنْ حُذَيْفَةَ، قَالَ قَالَ عُمَرُ أَيُّكُمْ يَحْفَظُ مَا قَالَ رَسُولُ اللَّهِ ﷺ فِي الْفِتْنَةِ فَقَالَ حُذَيْفَةُ أَنَا . قَالَ حُذَيْفَةُ فِتْنَةُ الرَّجُلِ فِي أَهْلِهِ وَمَالِهِ وَوَلَدِهِ وَجَارِهِ يُكَفِّرُهَا الصَّلاَةُ وَالصَّوْمُ وَالصَّدَقَةُ وَالأَمْرُ بِالْمَعْرُوفِ وَالنَّهْىُ عَنِ الْمُنْكَرِ . فَقَالَ عُمَرُ لَسْتُ عَنْ هَذَا أَسْأَلُكَ وَلَكِنْ عَنِ الْفِتْنَةِ الَّتِي تَمُوجُ كَمَوْجِ الْبَحْرِ قَالَ يَا أَمِيرَ الْمُؤْمِنِينَ إِنَّ بَيْنَكَ وَبَيْنَهَا بَابًا مُغْلَقًا . قَالَ عُمَرُ أَيُفْتَحُ أَمْ يُكْسَرُ قَالَ بَلْ يُكْسَرُ . قَالَ إِذًا لاَ يُغْلَقُ إِلَى يَوْمِ الْقِيَامَةِ . قَالَ أَبُو وَائِلٍ فِي حَدِيثِ حَمَّادٍ فَقُلْتُ لِمَسْرُوقٍ سَلْ حُذَيْفَةَ عَنِ الْبَابِ فَسَأَلَهُ فَقَالَ عُمَرُ .

قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ صَحِيحٌ .