Sahih Muslim Book - 38, Hadith - 5628

حَدَّثَنِي أَبُو الطَّاهِرِ ، أَخْبَرَنِي عَبْدُ اللهِ بْنُ وَهْبٍ ، حَدَّثَنِي عَمْرُو بْنُ الْحَارِثِ ، عَنْ بُكَيْرِ بْنِ الأَشَجِّ ، أَنَّ بُسْرَ بْنَ سَعِيدٍ ، حَدَّثَهُ أَنَّهُ سَمِعَ أَبَا سَعِيدٍ الْخُدْرِيَّ ، يَقُولُ : كُنَّا فِي مَجْلِسٍ عِنْدَ أُبَيِّ بْنِ كَعْبٍ ، فَأَتَى أَبُو مُوسَى الأَشْعَرِيُّ مُغْضَبًا حَتَّى وَقَفَ ، فَقَالَ : أَنْشُدُكُمُ اللَّهَ هَلْ سَمِعَ أَحَدٌ مِنْكُمْ رَسُولَ اللهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَقُولُ : الاِسْتِئْذَانُ ثَلاَثٌ ، فَإِنْ أُذِنَ لَكَ ، وَإِلاَّ فَارْجِعْ قَالَ أُبَيٌّ : وَمَا ذَاكَ ؟ قَالَ : اسْتَأْذَنْتُ عَلَى عُمَرَ بْنِ الْخَطَّابِ أَمْسِ ثَلاَثَ مَرَّاتٍ ، فَلَمْ يُؤْذَنْ لِي فَرَجَعْتُ ، ثُمَّ جِئْتُهُ الْيَوْمَ فَدَخَلْتُ عَلَيْهِ ، فَأَخْبَرْتُهُ ، أَنِّي جِئْتُ أَمْسِ فَسَلَّمْتُ ثَلاَثًا ، ثُمَّ انْصَرَفْتُ . قَالَ : قَدْ سَمِعْنَاكَ وَنَحْنُ حِينَئِذٍ عَلَى شُغْلٍ ، فَلَوْ مَا اسْتَأْذَنْتَ حَتَّى يُؤْذَنَ لَكَ قَالَ : اسْتَأْذَنْتُ كَمَا سَمِعْتُ رَسُولَ اللهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ : فَوَاللَّهِ ، لأُوجِعَنَّ ظَهْرَكَ وَبَطْنَكَ ، أَوْ لَتَأْتِيَنَّ بِمَنْ يَشْهَدُ لَكَ عَلَى هَذَا. فَقَالَ أُبَيُّ بْنُ كَعْبٍ : فَوَاللَّهِ ، لاَ يَقُومُ مَعَكَ إِلاَّ أَحْدَثُنَا سِنًّا ، قُمْ ، يَا أَبَا سَعِيدٍ ، فَقُمْتُ حَتَّى أَتَيْتُ عُمَرَ ، فَقُلْتُ : قَدْ سَمِعْتُ رَسُولَ اللهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَقُولُ هَذَا.

Abu Sa'eed Al-Khudri said: "We were in a gathering with Ubayy bin Ka'b, when Abi Musa Al-Ash'ari came, looking angry. He stood there and said: 'I adjure you by Allah, did anyone among you hear the Messenger of Allah (s.a.w) say: "Permission is to be sought three times, then if permission is given to you, (enter) otherwise go back"?' Ubayy said: 'Why is that?' He said: 'I asked permission to enter upon 'Umar bin Al-Khattab three times yesterday, but permission was not given to me, so I went back.' Then I came to him today and entered upon him, and I told him that I had come to him yesterday and said Salam three times, then I went away. He said: "We heard you but we were busy with something at that time. Why didn't you keep asking for permission until permission was given to you?" He said: "I asked permission as I heard the Messenger of Allah (s.a.w) (say we should ask permission)." He said: "By Allah, I will beat you on your back and your stomach if you do not bring someone to bear witness to that."' "Ubayy bin Ka'b said: 'By Allah, no one will go with you but the youngest of us. Get up, O Abu Sa'eed!' So I got up and went to 'Umar, and I said: 'I heard the Messenger of Allah (s.a.w) say that."'