Bismillahi ar-Rahmani ar-Raheem
In the Name of Allah, the Most Compassionate, the Most Merciful
BE CAREFUL WHO YOU CALL A KAFIR
Prophet Muhammad (Salalaho alehe wasalam) said : If a person says to his brother, O KAFIR (disbeliever) ! Then surely one of them is such. (i.e; Kafir) (Sahih Bukhari Volume 8 Book 73 Number 125)
Prophet Muhammad (Salalaho alehe wasalam) said : Any person who calls his brother: O Unbeliever! (then the truth of this label) would return to one of them. If it is true, (then it is) as he asserted, (but if it is not true), then it returns to him (and thus the person who made the accusation is an Unbeliever). [Sahih Muslim Book 001, Number 0117:]
Prophet Muhammad (Salalaho alehe wasalam) has warned us that if a person calls another KAFIR and the person called that is not one, then the individual who made the accusation is a KAFIR. And he/she has to perform TAJDEED-E-IMAAN and TAJDEED-E-NIKAH (if married)
Therefore, if you call other Muslims “kafir” or “mushrik” without discrimination, you could find that you have left Islam, according to the words of the Prophet (s.a.w.), in less than a second.
Be careful who you call Kafir because only Allah knows who is truly a rejector and who is merely a misguided person. It is not up to us to “sentence” a person to the Hellfire.
Imaan is our actual wealth. So we must be very careful while talking.
Waste no time in debating what a good Muslim should be. Be one!