It has become usual for many people to repeat everything they hear. However, the Prophet (صلی اللہ علیہ وسلم) warned us against that for several reasons. If we are indulging in vain discourse and talking about corruption and immorality, it could be fitnah for the people listening to us. We can so used to this and it could open the door to gossiping and backbiting, which are grave sins. The Prophet (صلی اللہ علیہ وسلم) said, “The gossip-monger will not enter paradise” [Bukhari/Muslim] And the Qur’an warned us against backbiting, likening it to eating the flesh of the person we are talking about.