Command to perform Salat (prayer) well

 327. Abu Hurairah narrated: One day the Messenger of Allah sallahu alayhi wa sallam led prayer- Then turning (towards his Companions) he said: ´´O so-and-so! why don´t you perform your Salat (prayer) well. Does not the performer of prayer see how he performs prayer, for he performs it for himself? By Allah, I see behind me as I see in front of me.´´