'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 in the week, I give tithes of all that I possess.

Now upon the first day of the week, very early in the morning, they came unto the sepulchre, bringing the spices which they had prepared, and certain others with them.