And when he made it terrifying by what he mentioned, he followed it with what human beings can know of its description, and he said, "A blazing fire." This means its heat has reached its peak; this is what you are familiar with among yourselves. As for the details, that is something only Allah, glorified and exalted is He, knows. This is the end of the calamity. The mutual blame of the first for the last is very clear and evident - and Allah knows best.