I was reading the deuterocanonical Book of Judith, and I came across the following:
Judith had lived as a widow in her house for three years and four months. She pitched a tent for herself on the roof of her house, put funeral clothing around her waist, and wore widow’s clothing. She fasted all the days of her widowhood except for the day before the Sabbath and the Sabbath itself, the day before the new moon, the day of the new moon, and the feasts and celebration days of the house of Israel. She was very beautiful and lovely to stare at. Her husband Manasseh left her gold and silver, male and female slaves, cattle, and fields, which she continued to oversee. And no one had a bad word to say about her, for she revered God greatly.
Being a Christian myself, I found this passage somewhat confusing because we Christians are forbidden to fast on Saturdays and Sundays (see the 66th Apostolic Canon) however we are required to fast on Wednesdays and Fridays (see the 69th Apostolic Canon)
However, I know that in Judaism, fasting is supposed to be done on Mondays and Thursdays, but is there any rule in the Jewish religion that forbids fasting on Fridays and Saturdays? If so, where is this rule written and what is the reasoning behind it?