Anas ibn Malik said, "When the people of Yemen came, the Prophet, may Allah bless him and grant him peace, said, 'The people of Yemen have arrived and they have gentler hearts than you. They are the first to offer the handshake.'"  

قَالَ النَّبِيُّ ﷺ قَدْ أَقْبَلَ أَهْلُ الْيَمَنِ وَهُمْ أَرَقُّ قُلُوبًا مِنْكُمْ فَهُمْ أَوَّلُ مَنْ جَاءَ بِالْمُصَافَحَةِ  

Al-Bara' ibn 'Azib said, "Part of the full greeting is to shake your brother's hand."  

أَنْ تُصَافِحَ أَخَاكَ