DIDACHE (c. 80-90)
Of Fast-Days and Prayer
8. Do not keep the same fast-days as the hypocrites. Mondays and Thursdays are their days for fasting, so yours should be Wednesdays and Fridays.
Your prayers, too, should be different from theirs. Pray as the Lord enjoined in His Gospel, thus: Our Father, who art in heaven, Hallowed be thy Name, Thy kingdom come, Thy will be done, As in heaven, so on earth; Give us this day our daily bread, And forgive us our debt as we forgive our debtors, And lead us not into temptation, But deliver us from the Evil One, For thine is the power and the glory for ever and ever.