Rasulullah ( sallallahu alayhi wasallam) sail: ” Allah Ta’ala fanned jahannam for a thousand years until its colour turned red. Thereafter he fanned it for a thousand years until its coulur turned white. He then fanned it for another thousand years until it turned black in color. Now it is absolutely black. If a heavy stone is dropped from one side of jahannam, it will continue descending for seventy years until it reaches the bottom of it. The person who will receive the lightest punishment in jahannam will be the person who will be made to wear shoes of fire whereby his brains will boil like a cauldron. He will be under the assumption that he is receiving the most severe punishment. The snakes of jahannam are as large as camels. If one of them had to bite once, its poison will continue rising for 40 years. The scorpions are as large as a pack saddled mule. If it had to bite once, the effect of its poison will last for 40 years. Once, after having performed the salaah, Rasulullah ( sallallahu Alayhi Wasallam ) climbed the pulpit and said ” While I was in my salaat. I saw Jannah exactly as they are. I haven’t seen anything better than jannah. Nor have I seen anything more harmful than jahannam.