I want to know that why Rasoolullah (Sallallahu Alaihi Wasallam) once actually ordered the Blessed Sahaabah to burn and demolish a Masjid (mosque) known as Masjid-e-Diraar?
In the name of Allah, the most Compassionate, the most Merciful
Paying attention to the verse below (Tu’bah: 107) could be helpful and useful in regarding the disadvantages of that Masjib (mosque)
وَالَّذِينَ اتَّخَذُوا مَسْجِدًا ضِرَارًا وَكُفْرًا وَتَفْرِيقًا بَيْنَ الْمُؤْمِنِينَ وَإِرْصَادًا لِّمَنْ حَارَبَ اللَّـهَ وَرَسُولَهُ مِن قَبْلُ ۚ وَلَيَحْلِفُنَّ إِنْ أَرَدْنَا إِلَّا الْحُسْنَىٰ ۖ وَاللَّـهُ يَشْهَدُ إِنَّهُمْ لَكَاذِبُونَ ﴿١٠٧
And [there are] those [hypocrites] who took for themselves a mosque for causing harm and disbelief and division among the believers and as a station for whoever had warred against Allah and His Messenger before. And they will surely swear, "We intended only the best." And Allah testifies that indeed they are liars. (107)
Hence it shows that they (Monafeqin or hypocrites) built that mosque to
- harm the Moslems,
- to circulate the kufr there,
making differences between believers
and so forth.