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"O you who believe! When you are told to make room in the assemblies, (spread out and) make room, Allaah will give you (ample) room (from His Mercy), And when you are told to rise up [for prayers, Jihaad (holy fighting in Allaah's Cause), or for any other good deed], rise up, Allaah will exalt in degree those of you who believe, and those who have been granted knowledge, And Allaah is Well-Acquainted with what you do." [Al-Mujaadilah (58):11]

Narrated Abu Huraira:

While the Prophet was saying something in a gathering, a Bedouin came and asked him, "When would the Hour (Doomsday) take place?" Allah's Apostle continued his talk, so some people said that Allah's Apostle had heard the question, but did not like what that Bedouin had asked. Some of them said that Alllah's Apostle had not heard it. When the Prophet finished his speech, he said, "Where is the questioner, who enquired about the Hour (Doomsday)?" The Bedouin said, "I am here, O Allah's Apostle ." Then the Prophet said, "When honesty is lost, then wait for the Hour (Doomsday)." The Bedouin said, "How will that be lost?" The Prophet said, "When the power or authority comes in the hands of unfit persons, then wait for the Hour (Doomsday.)" [The Book of Knowledge Volume 1, Book 3, Hadeeth 56]