Yazid ibn 'Abdullah said, "'Abdullah ibn 'Umar sent a slave of
his with some gold - or silver - and he changed it and deferred
the exchange (i.e. he changed gold into silver or vice versa and did not
take the money strai…
Abu Mas'ud said, "I was beating a slave of mine when I heard a
voice behind me, 'Know, Abu Mas'ud, that Allah is able to call you to account
for this slave.' I turned around and there was the Messenger of Allah,
may Alla…