The Ruling on Disliking Those Who Do Not Pray and Not Greeting Them
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Q: I dislike those who do not pray and I do not like to greet them. Is that permissible for me or not?
A: One who abandons the prayer, if he denies its obligation, is a disbeliever according to all scholars. And if he abandons it out of laziness, he is also a disbeliever according to the most correct of the scholars' opinions; based on the saying of the Prophet (peace and blessings be upon him):Sunan Ibn Majah 1079Sahih (Darussalam) and the saying of the Prophet (peace and blessings be upon him): Sahih Muslim 82b.
Once you know this, he is committing one of the major sins. Some scholars hold that he is a disbeliever if he abandons it, even if he does not deny its obligation. Therefore, boycotting the one who abandons the prayer is obligatory for every Muslim, just as it is obligatory to disapprove of him and warn him of the consequences of his action. It is obligatory for the authorities to demand his repentance; if he repents, well and good, otherwise he is to be killed.
A: One who abandons the prayer, if he denies its obligation, is a disbeliever according to all scholars. And if he abandons it out of laziness, he is also a disbeliever according to the most correct of the scholars' opinions; based on the saying of the Prophet (peace and blessings be upon him):
The covenant that distinguishes between us and them is prayer; so whoever leaves it, he has committed Kufr.
العهد الذي بيننا وبينهم الصلاة فمن تركها فقد كفرBetween man and polytheism and unbelief is the abandonment of salat.
بين الرجل وبين الشرك والكفر ترك الصلاةOnce you know this, he is committing one of the major sins. Some scholars hold that he is a disbeliever if he abandons it, even if he does not deny its obligation. Therefore, boycotting the one who abandons the prayer is obligatory for every Muslim, just as it is obligatory to disapprove of him and warn him of the consequences of his action. It is obligatory for the authorities to demand his repentance; if he repents, well and good, otherwise he is to be killed.
Source
binbaz.org.sa
The Arabic text is copied verbatim from the original source, without any edits.