'Week' in the Bible

Then the Warden of the Synagogue, indignant that Jesus had cured her on a Sabbath, said to the crowd, "There are six days in the week on which people ought to work. On those days therefore come and get yourselves cured, and not on the Sabbath day."

I fast twice a week. I pay the tithe on all my gains.'

And, on the first day of the week, at early dawn, they came to the tomb bringing the spices they had prepared.