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From: schechte@csd2.UUCP (asher schechter)
Newsgroups: net.religion.jewish
Subject: Re: Who is a *
Message-ID: <3780007@csd2.UUCP>
Date: Sat, 9-Feb-85 22:19:00 EST
Article-I.D.: csd2.3780007
Posted: Sat Feb  9 22:19:00 1985
Date-Received: Mon, 11-Feb-85 07:56:10 EST
References: <283@mhuxi.UUCP>
Organization: New York University
Lines: 10

I don't have time for a full response but I will give a few sources.
Megila 25,Yoma 86 & 38, Berachot 6,Baba Meziah 62, Avodah Zora 29 .
These are just a few of the many places in Talmud where we are instructed
how to deal with reshoim. 

It is though interesting to note that acording to Tosafos we may not hate
a rosho as a person rather we should hate him for his bad actions only.
So if you dislike someone you can't say well he is a rosho so I may hate
him.
                                             Asher Schechter