It is narrated from Sayyiduna Abu Sa'id Khudri, may Allah be pleased with him, that the Messenger of Allah, peace and blessings be upon him, said: The name of a valley in Hell is Wail; before reaching its bottom, a disbeliever will keep falling in it for forty years. Similarly, there is a mountain ahead in Hell named Sa'ud. Whoever climbs it, climbs for seventy years, then falls down from it for the same period, and this will continue with him forever and ever.