Allah revealed in the Qur’an:
يَا أَيُّهَا الَّذِينَ آمَنُوا قُوا أَنفُسَكُمْ وَأَهْلِيكُمْ نَارًا وَقُودُهَا النَّاسُ وَالْحِجَارَةُ عَلَيْهَا مَلائِكَةٌ غِلاظٌ شِدَادٌ لا يَعْصُونَ اللَّهَ مَا أَمَرَهُمْ وَيَفْعَلُونَ مَا يُؤْمَرُونَ
This means: “O you who believed, protect yourselves and families from fire, the fuel of which will be people and stones. In charge of this fire are stern and rough angels who do not disobey Allah and who carry out what they are ordered.” (Suratu t-Tahrim, Ayah 6)
