(28) باب مَا بَيْنَ النَّفْخَتَيْنِ
Abu Huraira reported Allah's Messenger (ﷺ) as saying:
Between the two blowings of the trumpet (there would be an interval of forty). They said: Abu Huraira, do you mean forty days? He said: I cannot say anything. They said: Do you mean forty months? He said: I cannot say anything. They said: Do you mean forty years? He said: I cannot say anything. Then Allah would cause the water to, descend from the sky and they (people) will sprout like vegetable. The only thing in a man which would not decay would be one bone (the tailbone) from which the whole frame would be reconstituted on the Day of Resurrection.
Reference: Sahih Muslim 2955 a
In-book reference: Book 54, Hadith 177
USC-MSA web (English) reference(deprecated numbering scheme): Book 41, Hadith 7055