Kal Muhl, the Prophet ﷺ said: "Like boiling oil, such that whenever it is brought near him the skin of his face falls into it." And also with this chain, from the is Prophet SAW, that he said: "If a bucket of Ghassaq were poured out in the world, the people of the world would rot. (Da'if) And the meaning of his statement: "The Kithaf of each wall" is its thickness.  

عَنِ النَّبِيِّ ﷺ قَالَ (كَالْمُهْلِ ) كَعَكَرِ الزَّيْتِ فَإِذَا قُرِّبَ إِلَيْهِ سَقَطَتْ فَرْوَةُ وَجْهِهِ فِيهِ وَبِهَذَا الإِسْنَادِ عَنِ النَّبِيِّ ﷺ قَالَ لِسُرَادِقِ النَّارِ أَرْبَعَةُ جُدُرٍ كِثَفُ كُلِّ جِدَارٍ مِثْلُ مَسِيرَةِ أَرْبَعِينَ سَنَةً وَبِهَذَا الإِسْنَادِ عَنِ النَّبِيِّ ﷺ قَالَ لَوْ أَنَّ دَلْوًا مِنْ غَسَّاقٍ يُهَرَاقُ فِي الدُّنْيَا لأَنْتَنَ أَهْلُ الدُّنْيَا