Performing two Rak´ah when one enters a mosque
248. Abu Qatadah narrated: I entered the mosque, when the Messenger of Allah salla alayhi wa sallam was sitting with people, i sat down with them. The Messenger of Allah salla alayhi wa sallam asked: ´´What prevented you from performing two Rak´ah before sitting down?´´ I said: ´´O Messenger of Allah! I saw you sitting and people were sitting.´´ He said: ´´When one of you enters the mosque, let him not sit before he performs two Rak´ah.´´