Al-Adab Al-Mufrad, Book 43, Hadith 1097 (English) ⓘ

A'yan al-Khwarizmi said, "We came to Anas ibn Malik while he was sitting his foyer with anyone else with him. My companion greeted him and said, 'May I come in?' Anas said, 'Come in. This is a place where no one asks for permission.' He had food brought to us and we ate. Then a cup of sweet nabidh was brought and we drank and were full."

حَدَّثَنَا مُوسَى بْنُ إِسْمَاعِيلَ، قَالَ‏:‏ حَدَّثَنَا أَعْيَنُ الْخُوَارِزْمِيُّ قَالَ‏:‏ أَتَيْنَا أَنَسَ بْنَ مَالِكٍ، وَهُوَ قَاعِدٌ فِي دِهْلِيزِهِ وَلَيْسَ مَعَهُ أَحَدٌ، فَسَلَّمَ عَلَيْهِ صَاحِبِي وَقَالَ‏:‏ أَدْخُلُ‏؟‏ فَقَالَ أَنَسٌ‏:‏ ادْخُلْ، هَذَا مَكَانٌ لاَ يَسْتَأْذِنُ فِيهِ أَحَدٌ، فَقَرَّبَ إِلَيْنَا طَعَامًا، فَأَكَلْنَا، فَجَاءَ بِعُسِّ نَبِيذٍ حُلْوٍ فَشَرِبَ، وَسَقَانَا‏.‏