It was narrated that Hudhaifah said:
“We were sitting with ‘Umar and he said: ‘Which of you has remembered a Hadith from the Messenger of Allah ﷺ concerning Fitnah?’” Hudhaifah said: “I said: ‘I have.’ He said: ‘You are very bold.’ He said: ‘How?’ He said: ‘I heard him say: “The fitnah of a man with regard to his family, his children and his neigbors are expiated by his prayers, fasts, charity and enjoining what is good and forbidding what is evil.” ‘Umar said: ‘This is not what I meant, rather I meant that which moves like the waves of the sea.’” Hudhaifah said: “Don’t worry about it, O Commander of the Believers! For there is a closed door between you and them.” ‘Umar said: “Will that door be broken or opened?” I said: “No, it will be broken.” ‘Umar said: “Then it will never be closed.’” We asked Hudhaifah: “Did ‘Umar know what that door meant?” He said: "Yes, just as he knows that there will be night before morning, because I narrated to him a Hadith in which there are no errors.” We were afraid to ask him who the door was, so we said to Masruq: “Ask him." He said: “‘Umar.”

حَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ اللَّهِ بْنِ نُمَيْرٍ، حَدَّثَنَا أَبُو مُعَاوِيَةَ، وَأَبِي، عَنِ الأَعْمَشِ، عَنْ شَقِيقٍ، عَنْ حُذَيْفَةَ، قَالَ كُنَّا جُلُوسًا عِنْدَ عُمَرَ فَقَالَ أَيُّكُمْ يَحْفَظُ حَدِيثَ رَسُولِ اللَّهِ ﷺ فِي الْفِتْنَةِ قَالَ حُذَيْفَةُ فَقُلْتُ أَنَا . قَالَ إِنَّكَ لَجَرِيءٌ قَالَ كَيْفَ قَالَ سَمِعْتُهُ يَقُولُ " فِتْنَةُ الرَّجُلِ فِي أَهْلِهِ وَوَلَدِهِ وَجَارِهِ تُكَفِّرُهَا الصَّلاَةُ وَالصِّيَامُ وَالصَّدَقَةُ وَالأَمْرُ بِالْمَعْرُوفِ وَالنَّهْىُ عَنِ الْمُنْكَرِ " . فَقَالَ عُمَرُ لَيْسَ هَذَا أُرِيدُ إِنَّمَا أُرِيدُ الَّتِي تَمُوجُ كَمَوْجِ الْبَحْرِ . فَقَالَ مَالَكَ وَلَهَا يَا أَمِيرَ الْمُؤْمِنِينَ إِنَّ بَيْنَكَ وَبَيْنَهَا بَابًا مُغْلَقًا . قَالَ فَيُكْسَرُ الْبَابُ أَوْ يُفْتَحُ قَالَ لاَ بَلْ يُكْسَرُ . قَالَ ذَاكَ أَجْدَرُ أَنْ لاَ يُغْلَقَ . قُلْنَا لِحُذَيْفَةَ أَكَانَ عُمَرُ يَعْلَمُ مَنِ الْبَابُ قَالَ نَعَمْ كَمَا يَعْلَمُ أَنَّ دُونَ غَدٍ اللَّيْلَةَ إِنِّي حَدَّثْتُهُ حَدِيثًا لَيْسَ بِالأَغَالِيطِ . فَهِبْنَا أَنْ نَسْأَلَهُ مَنِ الْبَابُ فَقُلْنَا لِمَسْرُوقٍ سَلْهُ فَسَأَلَهُ فَقَالَ عُمَرُ .