Well let me start with : God give a commandment to the Israelite s through Moses : six days you will labor and the seventh you will rest , it was called Sabbath ( not know if misspelled ) I am interested how and when it was changed to Sunday , and in the case of Islam why it was changed to Friday, I wonder if other culture in the east , about thir day of rest.
"Ancient Egypt had a ten-day week, three weeks per month with five extra days at the end of the year." http://en.wikipedia.org/wiki/Week
