Laylat ul Isra and Miraj means "The Night of Power and Ascension". It is when Muhammad was taken to "the farthest Mosque" (it was in Jerusalem) and was taken to see God. It was here that Muhammad and God talked about how many prayers should be said a day. God said there should be fifty prayers a day, but Moses and Muhammad asked for less, since fifty was hard to do every day. Eventually, fifty was lowered to five prayers a day. If the prayers were done well, they were worth fifty prayers.