Rasullullah sallallahu alaihi wasallam said: “There are people who do not transgress the laws of Allah Ta’ala whilst there are also others who do so. They are like two groups who boarded a ship, one of them settled on the upper deck and the other on the lower deck of the ship. So when the people of the lower deck needed water they said: “Why should we inconvenience the people of the upper deck when we can easily have plenty of water by making a hole in our deck.” Now if the people of the upper deck do not prevent this group from such foolishness, all of them will perish. But on the contrary if they stop them then all of them will be saved.

(Bukhari – vol:1, pg:339)

Lesson: Advising one another and accepting correction plays a vital role in the preservation of Islam and the muslims at large.