Sahih Al Bukhari – Book of To Make The Heart Tender (Ar-Riqaq)
Volumn 008, Book 076, Hadith Number 432.
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Narated By Abu Huraira : Allah's Apostle said, "Allah says, 'I have nothing to give but Paradise as a reward to my believer slave, who, if I cause his dear friend (or relative) to die, remains patient (and hopes for Allah's Reward)."
