Fiddler on the Roof

Wonder who came up with the bright idea of having a weekend in the first place? The Jewish Sabbath? The Christian Sunday or the Muslim Jumma? Did Indians get the concept of the 'rest-day' from one of these 'Abrahamitic' religions? Wonder what we did when we had no 'Sunday'? Or do primarily agricultural & trading societies not have any concept of 'resting' from work? Did the English bring it to us with their 'office-space' or the Persians with their 'duftars'?