Hadithcore
Al-Adab Al-Mufrad, 967
sahih· Al-Albani

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.'"

حَدَّثَنَا حَجَّاجٌ، قَالَ‏:‏ حَدَّثَنَا حَمَّادُ بْنُ سَلَمَةَ، عَنْ حُمَيْدٍ، عَنْ أَنَسِ بْنِ مَالِكٍ قَالَ‏:‏ لَمَّا جَاءَ أَهْلُ الْيَمَنِ قَالَ النَّبِيُّ صلى الله عليه وسلم‏:‏ قَدْ أَقْبَلَ أَهْلُ الْيَمَنِ وَهُمْ أَرَقُّ قُلُوبًا مِنْكُمْ، فَهُمْ أَوَّلُ مَنْ جَاءَ بِالْمُصَافَحَةِ‏.‏

References2 variants
In-Book Reference
Book 42, Hadith 3
English Reference
Book 42, Hadith 967