A man was with the Prophet (ﷺ) when another man passed by and the former said: "O Messenger of Allah! I love this man (for Allah's sake)". Messenger of Allah (ﷺ) asked, "Have you informed him?" He said, "No". Messenger of Allah (ﷺ) then said, "Tell him (that you love him)". So he went up to the man and said to him, "I love you for the sake of Allah;" and the other replied, "May Allah, for Whose sake you love me, love you."[Abu Dawud].