On what basis does the Church have the authority to establish days of fast and abstinence?
On the authority of Jesus Christ who told the leaders of His Church, "Whatever you bind on earth will be bound in heaven, and whatever you loose on earth will be loosed in heaven" (Matthew 16:19, 18:18). The language of binding and loosing (in part) was a rabinnic way of referring to the ability to establish binding halakah or rules of conduct for the faith community. To approach the issue from another angle, every family has the authority to establish particular family devotions for its members. Thus if the parents decide that the family will engage in a particular devotion at a particular time (say, Bible reading after supper), it is a sin for the children to disobey and skip the devotion for no good reason. In the same way, the Church as the family of God has the authority to establish its own family devotion, and it is a sin for the members of the Church to disobey and skip the devotions for no good reason (though of course if the person has a good reason, the Church dispenses him immediately).
Next: In addition to Ash Wednesday, are any other days during Lent days of fast?
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