Islamic schools of thought specially Deobandi are moderate movements and are away from extremism. And we cannot consider those extremist takfiri groups which for certain reasons, were formed within Deobandi school of thought, and have no support of the said school scholars, excommunicating and killing the Muslims, as the whole body of the school. The issue of takfir or excommunication has existed since early days of Islam and does not belong to a certain time or sect of Islam. And Islamic schools of thought have set some special standards and rules for it. This writing tries to explain the criterion for being Muslim or Kafir and clarify the standards of excommunication in Deobandi School. And tries to prove that the scholars and figures of Deobandi have not excommunicated the Muslims the people of Qibla according to delusive pretexts, and if some people in the name of this school, have excommunicated some of the Muslims and carried out terrorist attacks on them, the whole school cannot be accused of extremism.