A man's invitation is his permission

Abu'l-'Alaniyya said, "I came to Abu Sa'id al-Khudri and greeted him, but he did not give me permission. Then I greeted him again and he did not give me permission. Then I greeted him a third time, raising my voice and said, 'Peace be upon you, people of the house,' and he did not give me permission. Then I went off to one side and sat down. A slave boy came out to me and said, 'Enter.' I entered and Abu Sa'id said to me, 'If you had said it any more times, I would not have given you permission.' I asked him about vessels (i.e. those used for wine) and other things. He said, 'Haram.' I asked him about an old milk-skin made into a bucket for fermentation purposes. 'Haram,' he said."

حَدَّثَنَا مُوسَى بْنُ إِسْمَاعِيلَ، قَالَ: حَدَّثَنَا عَبْدُ الْوَاحِدِ، قَالَ: حَدَّثَنَا عَاصِمٌ، قَالَ: حَدَّثَنَا مُحَمَّدٌ، عَنْ أَبِي الْعَلاَنِيَةِ قَالَ: أَتَيْتُ أَبَا سَعِيدٍ الْخُدْرِيَّ فَسَلَّمْتُ فَلَمْ يُؤْذَنْ لِي، ثُمَّ سَلَّمْتُ فَلَمْ يُؤْذَنْ لِي، ثُمَّ سَلَّمْتُ الثَّالِثَةَ فَرَفَعْتُ صَوْتِي وَقُلْتُ: السَّلاَمُ عَلَيْكُمْ يَا أَهْلَ الدَّارِ، فَلَمْ يُؤْذَنْ لِي، فَتَنَحَّيْتُ نَاحِيَةً فَقَعَدْتُ، فَخَرَجَ إِلَيَّ غُلاَمٌ فَقَالَ: ادْخُلْ، فَدَخَلْتُ، فَقَالَ لِي أَبُو سَعِيدٍ: أَمَا إِنَّكَ لَوْ زِدْتَ لَمْ يُؤْذَنْ لَكَ، فَسَأَلْتُهُ عَنِ الأَوْعِيَةِ، فَلَمْ أَسْأَلْهُ عَنْ شَيْءٍ إِلاَّ قَالَ: حَرَامٌ، حَتَّى سَأَلْتُهُ عَنِ الْجَفِّ، فَقَالَ: حَرَامٌ. فَقَالَ مُحَمَّدٌ: يُتَّخَذُ عَلَى رَأْسِهِ إِدَمٌ، فَيُوكَأُ.