Sunan Ibn Majah 3716
It was narrated that Anas bin Malik  said:
"Whenever the Prophet(ﷺ) met a man, he would speak to him, and would not tun away until he (the other man) was the one who turned away. And if he shook hands with him, he would not withdraw his hand until he (the other man) withdrew his hand. And he was never seen sitting with his knees ahead of the knees of the one who was sitting next to him."
حَدَّثَنَا عَلِيُّ بْنُ مُحَمَّدٍ، حَدَّثَنَا وَكِيعٌ، عَنْ أَبِي يَحْيَى الطَّوِيلِ، - رَجُلٌ مِنْ أَهْلِ الْكُوفَةِ - عَنْ زَيْدٍ الْعَمِّيِّ، عَنْ أَنَسِ بْنِ مَالِكٍ، قَالَ كَانَ النَّبِيُّ ـ صلى الله عليه وسلم ـ إِذَا لَقِيَ الرَّجُلَ فَكَلَّمَهُ لَمْ يَصْرِفْ وَجْهَهُ عَنْهُ حَتَّى يَكُونَ هُوَ الَّذِي يَنْصَرِفُ وَإِذَا صَافَحَهُ لَمْ يَنْزِعْ يَدَهُ مِنْ يَدِهِ حَتَّى يَكُونَ هُوَ الَّذِي يَنْزِعُهَا وَلَمْ يُرَ مُتَقَدِّمًا بِرُكْبَتَيْهِ جَلِيسًا لَهُ قَطُّ ‏.‏