Sahih Bukhari

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

Once the Prophet (ﷺ) remained behind us in a journey. He joined us while we were performing ablution for the prayer which was over-due. We were just passing wet hands over our feet (and not washing them properly) so the Prophet (ﷺ) addressed us in a loud voice and said twice or thrice: "Save your heels from the fire."

Allah's Messenger (ﷺ) said, "Amongst the trees, there is a tree, the leaves of which do not fall and is like a Muslim. Tell me the name of that tree." Everybody started thinking about the trees of the desert areas. And I thought of the date-palm tree but felt shy to answer the others then asked, "What is that tree, O Allah's Messenger (ﷺ) ?" He replied, "It is the date-palm tree."