WHAT IS TAKFIR AND WHAT ARE THE TYPES?
The excessive and unfounded (without evidence or method of Ahl us-Sunna) takfir is actually a state of ill will or an unhealthy mind or sick mind which are in a state of rebellion against their surrounding or the people who are around them. And this sick mentality contains a desire for retaliation against those who oppose them in
opinion and action. Therefore, we must warn people against this type of mentality and attitude, for it is a definite harm hidden under the cloak of religion and discipline. Hence the statement of the Messenger against the Takfiri and Khawaarij are stern and decisive indeed. He said, that they will fly out of the religion. That is their description and when it comes to the verdict against them, ‘I will kill them as the killing of Aad and Thamud,’ which means to be killed as the worst of the kuffar. This is why some scholars call the Khawaarij kuffar in one moment and sometimes they do not due to this clear statement of the Messenger. However, they all agree in the end that if they group together and cause physical harm to Muslims, they should be fought harshly.
It is narrated by Dahhaak that the Messenger of Allah (SAW) said, ‘Whoever curses a believer, it is as if he killed him and whoever throws the charge of kufr at a believer, it is as if he killed him.’
It is narrated by `Abdullah ibn `Umar that the Prophet (SAW) said, ‘Whenever a man says to his brother, O kaafir, then one of them as one (a kaafir).’
Dahhaak has also narrated that the Prophet (SAW) said, ‘Cursing a believer is like killing him. And whoever threw the charge of kufr as a believer, it is as if he killed him.’