It is related by Hadrat Abu Huraira (May Allah be pleased with him) that Prophet Mohammad (sallallahu alayhi wasallam – peace be upon him) said: Allah (The Glorified and the Exalted) says, "Whoever is hostile to one whom I befriend, is at war with Me. When a servant of Mine approaches Me through the medium of that which I like best, out of what I have declared obligatory for him, and continues to advance towards Me through optional prayers (Nawafil), then I begin to love him. When I make him My beloved, I become his ears to hear, and his eyes to see and his hands to grasp, and his feet to walk. When he asks Me, I grant him and when he seeks My protection I protect him. (Bukhari) (Hadith Qudsi)
In another narration by Hadrat Abu Huraira (May Allah be pleased with him): Allah's Messenger (sallallahu alayhi wasallam – peace be upon him) said, "If Allah loves a person (The Glorified and the Exalted). He calls Hadrat Jibril (peace be upon him) saying: "Allah loves so and so.
O Jibril love him. So Jibril (peace be upon him) would love him and then would make an announcement in the Heavens: "Allah loves so and so therefore you should love him also. So all the dwellers of the Heavens would love him and then he is granted the pleasure of the people on the earth." (Bukhari)