Sahih Muslim Book - 38, Hadith - 5629

حَدَّثَنَا نَصْرُ بْنُ عَلِيٍّ الْجَهْضَمِيُّ ، حَدَّثَنَا بِشْرٌ ، يَعْنِي ابْنَ مُفَضَّلٍ ، حَدَّثَنَا سَعِيدُ بْنُ يَزِيدَ ، عَنْ أَبِي نَضْرَةَ ، عَنْ أَبِي سَعِيدٍ ، أَنَّ أَبَا مُوسَى ، أَتَى بَابَ عُمَرَ ، فَاسْتَأْذَنَ ، فَقَالَ عُمَرُ وَاحِدَةٌ ، ثُمَّ اسْتَأْذَنَ الثَّانِيَةَ ، فَقَالَ عُمَرُ: ثِنْتَانِ ، ثُمَّ اسْتَأْذَنَ الثَّالِثَةَ ، فَقَالَ عُمَرُ : ثَلاَثٌ ، ثُمَّ انْصَرَفَ فَأَتْبَعَهُ فَرَدَّهُ ، فَقَالَ : إِنْ كَانَ هَذَا شَيْئًا حَفِظْتَهُ مِنْ رَسُولِ اللهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَهَا ، وَإِلاَّ ، فَلأَجْعَلَنَّكَ عِظَةً ، قَالَ أَبُو سَعِيدٍ : فَأَتَانَا فَقَالَ : أَلَمْ تَعْلَمُوا أَنَّ رَسُولَ اللهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: الاِسْتِئْذَانُ ثَلاَثٌ ؟ قَالَ: فَجَعَلُوا يَضْحَكُونَ ، قَالَ: فَقُلْتُ: أَتَاكُمْ أَخُوكُمُ الْمُسْلِمُ قَدْ أُفْزِعَ ، تَضْحَكُونَ ؟ انْطَلِقْ فَأَنَا شَرِيكُكَ فِي هَذِهِ الْعُقُوبَةِ ، فَأَتَاهُ فَقَالَ: هَذَا أَبُو سَعِيدٍ.

It was narrated from Abu Sa'eed that Abu Musa went to 'Umar's door and asked for permission to enter. 'Umar said: "One." He asked permission a second time and 'Umar said: "Two." He asked permission a third time, and 'Umar said: "Three." Then he went away. 'Umar sent someone after him to bring him back. He ('Umar) said: "If this is something that you learned from the Messenger of Allah (s.a.w), all well and good, otherwise I will make an example of you." Abu Sa'eed said: "He came to us and said: 'Do you not know that the Messenger of Allah (s.a.w) said: "Permission is to be sought three times?"' They started laughing and I said: 'Your Muslim brother comes to you upset and you laugh? Let's go, and I will be your partner in this trouble.' He said: 'This is Abu Sa'eed."'