Five trials have been placed in this Ummah

It is narrated from Sayyiduna Ali (may Allah be pleased with him) that he said: "Five tribulations have been appointed for this Ummah: a general tribulation, then a particular tribulation, then a general tribulation, then a particular tribulation, then will come the blind, deaf and all-encompassing tribulation in which people will become like cattle (devoid of reason)."
This hadith has a sahih (authentic) chain, but the two Shaykhs did not record it.

It is narrated from Abu Thawr; he said: I came to Sayyiduna Hudhayfah and Sayyiduna Abu Mas'ud (may Allah be pleased with them both) while they were engaged in conversation in the mosque. They mentioned tribulation, and Hudhayfah (may Allah be pleased with him) said: "I did not think that this tribulation would turn back on its heels in such a way that not even a cupping-glass's worth of blood would have been shed in it. And indeed a man will be a believer in the morning and become a disbeliever by the evening, and will be a believer in the evening and become a disbeliever by the morning. He will fight in the tribulation today and tomorrow Allah will kill him. His heart will be turned upside down so that its lower part comes on top." Then Abu Mas'ud (may Allah be pleased with him) said: "You have spoken the truth; this is how the Messenger of Allah (peace and blessings be upon him) told us about the tribulation."
This hadith has a sahih (authentic) chain, but the two Shaykhs did not record it. Abu Thawr is among the senior Tabi'in, and Abu al-Bakhtari lived in the time of Sayyiduna Hudhayfah (may Allah be pleased with him).