عَنْ مُعَاذِ بْنِ جَبَلٍ رَضِيَ اللَّهُ عَنْهُ أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ قَالَ: ((إِنَّ الشَّيْطَانَ ذِئْبُ الْإِنْسَانِ كَذِئْبِ الْغَنَمِ يَأْخُذُ الشَّاةَ الْقَاصِيَةَ وَالنَّاحِيَةَ فَإِيَّاكُمْ وَالشِّعَابَ وَعَلَيْكُمْ بِالْجَمَاعَةِ وَالْعَامَّةِ وَالْمَسْجِدِ))
It is narrated from Sayyiduna Mu'adh bin Jabal (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: Surely, Satan is to man like a wolf is to sheep; he seizes the one that strays far and remains apart. So beware of the ravines, and adhere to the congregation, the general body of Muslims, and the mosque.