Silsilat al-Ahadith al-Sahihah

Sayyiduna Anas bin Malik (may Allah be pleased with him) says that when the people of Yemen came, the Noble Prophet (peace and blessings be upon him) said: "The people of Yemen have come; they are more soft-hearted than you." Sayyiduna Anas (may Allah be pleased with him) said: They were the first people who initiated handshaking.