Al-Adab Al-Mufrad, Book 42, Hadith 48 (In-Book) ⓘ

Anas ibn Malik reported that the Companions of the Prophet, may Allah bless him and grant him peace, used to gather and they would turn towards the tree and a group of them would go to the right and a group to its left. When they met again, they would greet one another.

حَدَّثَنَا مُوسَى بْنُ إِسْمَاعِيلَ، قَالَ‏:‏ حَدَّثَنَا الضَّحَّاكُ بْنُ نِبْرَاسٍ أَبُو الْحَسَنِ، عَنْ ثَابِتٍ الْبُنَانِيِّ، عَنْ أَنَسِ بْنِ مَالِكٍ، أَنَّ أَصْحَابَ النَّبِيِّ صلى الله عليه وسلم كَانُوا يَكُونُونَ مُجْتَمِعِينَ فَتَسْتَقْبِلُهُمُ الشَّجَرَةُ، فَتَنْطَلِقُ طَائِفَةٌ مِنْهُمْ عَنْ يَمِينِهَا وَطَائِفَةٌ عَنْ شِمَالِهَا، فَإِذَا الْتَقَوْا سَلَّمَ بَعْضُهُمْ عَلَى بَعْضٍ‏.‏