It is narrated from Sayyiduna Abbas (may Allah be pleased with him) that once I submitted in the presence of the Messenger: O Messenger of Allah! When the people of Quraysh meet each other, they meet with very cheerful faces, but when they meet us, they do so like strangers? Upon this, the Prophet (peace and blessings be upon him) became very displeased and said: "By Him in Whose hand is my soul, faith cannot enter a person's heart until he loves you for the sake of Allah and His Messenger."