Can Church A Badmouth Church B?

There are four possible scenarios: 
Church A - The church
badmouthing Church B
  Church B - The church suffering
the verbal attack

Scenario Two:  
Church A is a true church of God
and Church B is not
The true church has no biblical mandate to attack a false church.  Anyone can attack a false doctrine regardless of who teaches it, but they cannot attack the congregation or leaders.
 

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