Kitab al-Fitan · Nu'aym ibn Hammad

Narrated Hudhaifa:Once `Umar bin Al-Khattab said, "Who amongst you remembers the statement of Allah's Apostle regarding the afflictions?" Hudhaifa replied, "I remember what he said exactly." `Umar said, "Tell (us), you are really a daring man!" Hudhaifa said, "Allah's Messenger (ﷺ) said, 'A man's afflictions (i.e. wrong deeds) concerning his relation to his family, his property and his neighbors are expiated by his prayers, giving in charity and enjoining what is good and forbidding what is evil.' " `Umar said, "I don't mean these afflictions but the afflictions that will be heaving up and down like waves of the sea." Hudhaifa replied, "O chief of the believers! You need not fear those (afflictions) as there is a closed door between you and them." `Umar asked, "Will that door be opened or broken?" Hudhaifa replied, "No, it will be broken." `Umar said, "Then it is very likely that the door will not be closed again." Later on the people asked Hudhaifa, "Did `Umar know what that door meant?" He said, "Yes, `Umar knew it as everyone knows that there will be night before the tomorrow morning. I narrated to `Umar an authentic narration, not lies." We dared not ask Hudhaifa; therefore we requested Masruq who asked him, "What does the door stand for?" He said, "`Umar

It was narrated from Abu Musa Al-Ash’ari that the Messenger of Allah (ﷺ) said:“Before the Hour comes, there will be tribulation like pieces of black night, when a man will wake up as a believer but be a disbeliever by evening, or he will be a believer in the evening but will be a disbeliever by morning. And the one who is sitting will be better than the one who is standing, and the one who is standing will be better than the one who is walking, and the one who is walking will be better than the one who is running. So break your bows, cut their strings and strike your swords against rocks, and if anyone enters upon anyone of you, let him be like the better of the two sons of Adam. (i.e. the one killed, not the killer).”

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

You will not fight after this day until the Day of Resurrection