Sunan an-Nasai Book 24, Hadith 2906

أَخْبَرَنَا يَعْقُوبُ بْنُ إِبْرَاهِيمَ، قَالَ حَدَّثَنَا هُشَيْمٌ، قَالَ أَنْبَأَنَا ابْنُ عَوْنٍ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، قَالَ دَخَلَ رَسُولُ اللَّهِ صلى الله عليه وسلم الْبَيْتَ وَمَعَهُ الْفَضْلُ بْنُ عَبَّاسٍ وَأُسَامَةُ بْنُ زَيْدٍ وَعُثْمَانُ بْنُ طَلْحَةَ وَبِلاَلٌ فَأَجَافُوا عَلَيْهِمُ الْبَابَ فَمَكَثَ فِيهِ مَا شَاءَ اللَّهُ ثُمَّ خَرَجَ ‏.‏ قَالَ ابْنُ عُمَرَ كَانَ أَوَّلُ مَنْ لَقِيتُ بِلاَلاً قُلْتُ أَيْنَ صَلَّى النَّبِيُّ صلى الله عليه وسلم قَالَ مَا بَيْنَ الأُسْطُوَانَتَيْنِ ‏.‏

It was narrated that Ibn Umar said:"The Messenger of Allah entered the House, accompanied by Al-Fadl bin abbas, Usmah bin Zaid,. Uthman bin Talhah and Bilal. They shut the door, and he stayed there for as long as Allah willed, then he coame out." Ibn Umar said: "The first one whom I met was Bilal, and I said: "Where did the Prophet pray?' He said: "Between the two columns