LORELAI: Rory, my heart. It is Saturday, the day of rest.
RORY: Sunday’s the day of rest.
In Jewish and Christian tradition, the Sabbath is the “day of rest”, which is supposed to mimic the rest that God took after creating the universe, as told in the first chapters of Genesis. Jews and some Christian faiths (such as Seventh Day Adventists) believe Saturday is the day of rest, while most Christians think it is Sunday.