Narrated Abu Sa'eed:
that the Prophet (ﷺ) said: "Woe is the valley of Jahannam, the disbeliever shall drop into it for forty autumns before he reaches its bottom." (FR)
English reference (FR): Vol. 5, Book 44, Hadith 3164 (FR)
Arabic reference (FR): Book 47, Hadith 3461 (FR)