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These are ahadith regarding the excellence of love for the sake of Allah and encouraging it, and a man who loves another informing him of that and what he says to him when he informs him The excellence of love for the sake of Allah:
375. Anas reported that the Prophet, may Allah bless him and grant him peace, said, "Anyone who possesses three attributes will experience the sweetness of belief: that he loves Allah and His Messenger more than anything else; that he loves someone for the sake of Allah alone; and that he hates the idea of reverting to disbelief as much as he would hate being thrown into a fire." [Agreed upon]
376. Abu Hurayra reported that the Prophet, may Allah bless him and grant him peace, said, "There are seven whom Allah will shade with His shade on the day when there is no shade but His shade: a just Imam, a youth who grows up worshipping Allah, the Mighty and Exalted, a man whose heart is attached to the mosque, two men who love each other for the sake of Allah, meeting and parting for that reason alone, a man who refuses the advances of a noble and beautiful woman, saying, 'I fear Allah', a man who gives sadaqa and conceals it so that his left hand does not know what his right hand gives, and a man who remembers Allah when he is alone and his eyes overflow with tears." [Agreed upon]
377. Abu Hurayra reported that the Messenger of Allah, may Allah bless him and grant him peace, said, "Allah Almighty will say on the Day of Rising, 'Where are those who loved one another for the sake of My majesty? Today, on the day when there is no shade but My shade, I will shade them.'" [Muslim]
378. Abu Hurayra reported that the Messenger of Allah, may Allah bless him and grant him peace, said, "By the one who has my soul in His hand, you will not enter the Garden until you believe, and you will not believe until you love one another. Shall I point out to you something which will make you love one another if you do it? Make the greeting widespread among you." [Muslim]
Reference:
http://www.sunnipath.com/library/Hadith/H0004P0046.aspx