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"And to Allaah belongs all that is in the heavens and all that is in the earth, And verily, We have recommended to the people of the Scripture before you, and to you (O Muslims) that you (all) fear Allaah, and keep your duty to Him, But if you disbelieve, then unto Allaah belongs all that is in the heavens and all that is in the earth, and Allaah is Ever Rich (Free of all wants), Worthy of all praise." [An-Nisaa' (4):131]

Narrated Sa'd:

Allah's Apostle distributed (Zakat) amongst (a group of) people while I was sitting there but Allah's Apostle left a man whom I thought the best of the lot. I asked, "O Allah's Apostle! Why have you left that person? By Allah I regard him as a faithful believer." The Prophet commented: "Or merely a Muslim." I remained quiet for a while, but could not help repeating my question because of what I knew about him. And then asked Allah's Apostle, "Why have you left so and so? By Allah! He is a faithful believer." The Prophet again said, "Or merely a Muslim." And I could not help repeating my question because of what I knew about him. Then the Prophet said, "O Sa'd! I give to a person while another is dearer to me, for fear that he might be thrown on his face in the Fire by Allah." [The Book of Faith Volume 1, Book 2, Hadeeth 26]