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Narrated Ali ibn AbuTalib: A time is certainly coming to mankind when people will bite each other and a rich man will hold fast, what he has in his possession (i.e. his property), though he was not commanded for that. Allah, Most High, said: "And do not forget liberality between yourselves." The men who are forced will contract sale while the Prophet (peace_be_upon_him) forbade forced contract, one which involves some uncertainty, and the sale of fruit before it is ripe.