The Didache is first-century document which describes the practice of fasting in the earliest Church.
Chapter 8. Fasting and Prayer (the Lord’s Prayer). But let not your fasts be with the hypocrites, for they fast on the second and fifth day of the week. Rather, fast on the fourth day (Wednesday) and the Preparation (Friday).
This matches the Orthodox Church practice of weekly fasting on Wednesdays and Fridays.
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