Anas ibn Malik said, "When the people of Yemen came, the Prophet ﷺ 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