Commercial Transactions (Kitab Al-Buyu)

Dawud :: Book 22 : Hadith 3376

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.