Abu Sa'eed narrated that:
The Messenger of Allah said: "As-Sa'ud is a mountain of fire, a disbeliever will be rised upon it for seventy autumns, and them similarly he will fall down it, forever." (ES)
English reference (ES): Vol. 5, Book 44, Hadith 3326 (ES)
Arabic reference (ES): Book 47, Hadith 3645 (ES)