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 ـ صلى الله عليه وسلم ـ 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 ‏.‏

It was narrated that Hudhaifah said: “We were sitting with ‘Umarand he said: ‘Which of you has remembered a Hadith from theMessenger of Allah (PBUH) concerning Fitnah?’” Hudhaifah said: “Isaid: ‘I have.’ He said: ‘You are very bold.’ He said: ‘How?’He said: ‘I heard him say: “The fitnah of a man with regard tohis family, his children and his neigbors are expiated by hisprayers, fasts, charity and enjoining what is good and forbiddingwhat is evil.” ‘Umar said: ‘This is not what I meant, rather Imeant that which moves like the waves of the sea.’” Hudhaifahsaid: “Don’t worry about it, O Commander of the Believers! Forthere is a closed door between you and them.” ‘Umar said: “Willthat 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.” Translation Not Available

Book Ref: Sunan Ibn Majah Book 36 Hadith 3955
Web Ref:  Sunan Ibn Majah Vol 5 Book 36 Hadith 3955