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"And the two seas (kinds of water) are not alike, this fresh sweet, and pleasant to drink, and that saltish and bitter, And from them both you eat fresh tender meat (fish), and derive the ornaments that you wear, And you see the ships cleaving (the sea-water as they sail through it), that you may seek of His Bounty, and that you may give thanks." [Faatir (35):12]

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]