Allah's Apostle said, "If Allah wants to do good to somebody, He afflicts him with trials."

Narrated Abu Huraira:

Allah's Apostle said, "The example of a believer is that of a fresh tender plant; from whatever direction the wind comes, it bends it, but when the wind becomes quiet, it becomes straight again. Similarly, a believer is afflicted with calamities (but he remains patient till Allah removes his difficulties.) And an impious wicked person is like a pine tree which keeps hard and straight till Allah cuts (breaks) it down when He wishes." (See Hadith No. 558, Vol. 9.)

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Volume 7, Book 70, Number 548:

Narrated Abu Huraira:

Allah's Apostle said, "If Allah wants to do good to somebody, He afflicts him with trials."