It is narrated from Hazrat Anas (may Allah be pleased with him) that once I was sitting in the gathering of the Prophet (peace and blessings be upon him) when a man passed by. Someone among those sitting said, "O Messenger of Allah (peace and blessings be upon him)! I love this person." The Prophet (peace and blessings be upon him) said to him, "Have you told him this?" He replied, "No." The Prophet (peace and blessings be upon him) said, "Then go and tell him." So that man stood up, went to him and said, "Brother! I love you for the sake of Allah." He replied, "May He for whose sake you love me, love you in return."