Well I thought no human being can be sinless because Muhammad (PBUH) and Jesus (PBUH) prayed for forgiveness. When Muslims pray we normally make a Dua'a and pray for forgiveness and a place in heaven and to keep away from the Dajjal etc etc. So that made me jump to the conlusion that prophet Muhammad (PBUH) made at least some sins because he prayed a lot more than just 5 times a day, and Isa (Jesus) PBUH also prayed like us Muslims pray. But since Marco100 said "Mistakes and sin are not the same" this now makes me think that he was sinless (infallible) but made some mistakes which Allah did not like. What I want to know is what were the mistakes he made?