Advice for those who do not maintain the cleanliness of the mosque?
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Question : The questioner says: Honorable Shaykh, may Allah preserve you, is there any advice for some people who, in the Sacred House of Allah, do not maintain the cleanliness of the mosque when they eat? May Allah reward you with good.
Answer : The Prophet (peace and blessings be upon him) said that the rewards of my Ummah were presented to me, down to the removal of a speck of dust from the mosque. So whoever keeps the mosques free from harm has a reward, and whoever pollutes them with various pollutants is either a sinner or one who opposes the Shari'ah without sin. It appears that he sins if he finds something dirty or harmful in the mosque and does not wipe it away or report it, based on the saying of Allah the Exalted:[Al-Ma'idah 5:2]
Answer : The Prophet (peace and blessings be upon him) said that the rewards of my Ummah were presented to me, down to the removal of a speck of dust from the mosque. So whoever keeps the mosques free from harm has a reward, and whoever pollutes them with various pollutants is either a sinner or one who opposes the Shari'ah without sin. It appears that he sins if he finds something dirty or harmful in the mosque and does not wipe it away or report it, based on the saying of Allah the Exalted:
And cooperate in righteousness and piety, but do not cooperate in sin and aggression.
وَتَعَاوَنُوا عَلَى الْبِرِّ وَالتَّقْوَىٰ وَلَا تَعَاوَنُوا عَلَى الْإِثْمِ وَالْعُدْوَانِ
Source
قناة «فضيلة الشيخ محمد بن صالح العثيمين»، لقاء[17 من 63] نصيحة لمن لا يحافظون على نظافة المسجد؟!! الشيخ ابن عثيمين - مشروع كبار العلماء — youtube.com
The Arabic text is a machine transcription of the audio recording.