What did the Prophet Muhammad (saw) say about a man's good deed that made him enter Paradise?
      Narrated Abu Huraira:                          The Prophet said, "A man saw a dog eating mud from (the severity of)      thirst. So, that man took a shoe (and filled it) with water and kept      on pouring the water for the dog till it quenched its thirst. So Allah     approved of his deed and made him to enter Paradise."