General Behavior (Kitab Al-Adab)

Dawud :: Book 41 : Hadith 5106

Narrated Anas ibn Malik:

A man was with the Prophet (peace_be_upon_him) and a man passed by him and said: Apostle of Allah! I love this man. The Apostle of Allah (peace_be_upon_him) then asked: Have you informed him? He replied: No. He said: Inform him. He then went to him and said: I love you for Allah's sake. He replied: May He for Whose sake you love me love you!