It was a usual meeting.  The Prophet (s.a.w.) was in his place and his companions gathered around him to hear the words of wisdom and guidance.  Suddenly a poor man in rags appeared, saluted the assembly.

        "Salaamun Alaikum" and finding a vacant place, comfortably sat down.  The Prophet (s.a.w.) had taught them that all Muslims were brothers and in an assembly one should sit wherever one finds a place, regardless of any status.  Now, it so happened that this poor man sat next to a very rich man.  The rich man felt disturbed and tried to collect the edges of his dress around himself, so that the poor man did not touch them.  The Prophet (s.a.w) observed this and addressing the rich man he said:
        "Perhaps you were afraid that his poverty would effect you?"
        "No, O Messenger of  Allah," he said.
        "Then perhaps you were apprehensive about some of your wealth flying away to him?"
        "No, O Messenger of Allah."
        "Or you feared that your clothes would become dirty if he touches them?"
        "No, O Messenger of Allah."
        "Then why did you draw yourself and your clothes away from him?"

        The rich man said: "I admit that was the the most undesirable thing to do.  It was an error and I confess my guilt.  Now to make amends for it, I will give away half of my wealth to this Muslim brother so that I may be forgiven."

        Just as he said this, the poor man rose and said:
        "O Prophet of Allah, I do not accept his offer."

        People present were all taken by surprise.  They thought the poor man was a fool.  But he explained:
        "O Prophet of Allah, I refuse to accept his offer because I fear that I might then become arrogant and ill-treat my Muslim brothers the way he did to me."
 

Reference:
Pearls of Wisdom.  A String of Incidents in the History of Islam.  The World Federation of Khoja Shia Ithna-Asheri Muslim Communities. Page 64.