The description of the (Hell) Fire and the fact that it has already been created Sahih al-Bukhari 3266
Arabic hadith text
حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، حَدَّثَنَا سُفْيَانُ، عَنْ عَمْرٍو، سَمِعَ عَطَاءً، يُخْبِرُ عَنْ صَفْوَانَ بْنِ يَعْلَى، عَنْ أَبِيهِ، أَنَّهُ سَمِعَ النَّبِيَّ صلى الله عليه وسلميَقْرَأُ عَلَى الْمِنْبَرِ {وَنَادَوْا يَا مَالِكُ }.
Translation
Narrated Yali
That he heard the Prophet (ﷺ) on the pulpit reciting:-- "They will cry: "O Malik!' (43.77) (Malik is the gate-keeper (angel) of the (Hell) Fire.)