One night a house in Medina was burnt with its occupants. The Prophet ﷺ spoke about them, saying, "This fire is indeed your enemy, so whenever you go to bed, put it out to protect yourselves."
احْتَرَقَ بَيْتٌ بِالْمَدِينَةِ عَلَى أَهْلِهِ مِنَ اللَّيْلِ فَحُدِّثَ بِشَأْنِهِمُ النَّبِيُّ ﷺ قَالَ إِنَّ هَذِهِ النَّارَ إِنَّمَا هِيَ عَدُوٌّ لَكُمْ فَإِذَا نِمْتُمْ فَأَطْفِئُوهَا عَنْكُمْ