Hadith ~ When is the Last Hour?

Abu Hurayra said that once, while the Prophet, may Allah bless him and grant him peace, was in an assembly talking to the people, a Bedouin came and asked, "When is the Last Hour?" The Messenger of Allah continued talking upon which some people said that the Messenger of Allah had heard what the man had said and disliked it while others said that he had simply not heard it. When the Messenger of Allah, may Allah bless him and grant him peace, had finished what he was saying, he asked, "Where is the person who asked about the Hour?" He said, "Here I am, Messenger of Allah." The Prophet said, "When trustworthiness has been lost, then expect the Hour." The Bedouin said, "How will it be lost?" The Prophet replied, "When authority lies with other than those who should rightfully have it, then expect the Hour." [al-Bukhari]

Riyad as-Salihin (The Meadows of the Righteous) of Iman Mohieddine Annawawi 631-676.  Chapter 370: "On various stories", Hadith  1837.