Fasting in the Early Church: Acts, the Didache, and the First Christians

The early church fasted on Wednesdays and Fridays, before baptisms, and at the ordination of leaders. The Didache (c. 100 AD) instructed Christians to fast on those days instead of the Jewish Monday and Thursday fasts. Acts 13:2–3 (ESV) records the Antioch church fasting when the Holy Spirit set apart Paul and Barnabas for mission.

Fasting did not end with the apostles — it grew. In the first centuries after Christ, the church developed a rich and surprisingly specific practice of fasting: weekly fasts on Wednesdays and Fridays, fasts before baptism, fasts before ordination, and the great pre-Easter fast that became Lent. To understand where Christian fasting came from, we have to read Acts alongside the Didache, the early church fathers, and the council records that shaped what Christians did with their appetites for the next two millennia.

From the Day of Atonement to the Lord's Return

Jewish fasting in Jesus's day was anchored in the Day of Atonement (Yom Kippur), the one fast commanded in the Torah (Leviticus 16:29, ESV), and reinforced by the regular Monday and Thursday fasts of the Pharisees. The early Christians, almost all of them Jewish at first, inherited this rhythm. But the resurrection changed the calendar.

Jesus had said, "The days will come when the bridegroom is taken away from them, and then they will fast" (Matthew 9:15, ESV). After the ascension, the church began to shape its own fasting practice around the memory of Christ's passion. The Didache, an early Christian manual usually dated to around 96–110 AD, makes the shift explicit.

The Didache: Wednesdays and Fridays

The Didache (Greek for "teaching") is one of the earliest non-canonical Christian documents we have. Discovered in 1873 in a monastery in Constantinople and likely composed in Syria or Palestine, it gives us a window into church practice at the turn of the second century. Chapter 8 contains a striking instruction:

Your fasts must not be identical with those of the hypocrites. They fast on Mondays and Thursdays; you should fast on Wednesdays and Fridays.— Didache 8.1 (c. 100 AD)

Wednesday commemorated the betrayal of Jesus by Judas; Friday commemorated the crucifixion. By moving the weekly fast to these days, the early church rooted fasting in the gospel story rather than in the Jewish liturgical calendar. The Wednesday/Friday fast — sometimes called the "stations" — became the standard Christian weekly fast for centuries and is still observed in the Eastern Orthodox, Coptic, and some Catholic and Anglican traditions.

Fasting Before Baptism

The Didache also prescribed fasting before baptism — for the candidate, the baptizer, and any others who were able (Didache 7.4). This practice spread quickly. By the third century, the period of pre-baptismal fasting had expanded into the forty-day season of Lent, during which catechumens (those preparing for baptism at Easter) fasted and were instructed in the faith. The whole church often fasted in solidarity with them.

Hippolytus of Rome, in his Apostolic Tradition (c. 215 AD), describes catechumens fasting for two days before their Easter baptism, with exorcists and sponsors at their side. By the fourth century, when Emperor Constantine legalized Christianity and adult baptisms surged, the catechumenate had become a multi-year journey capped by a forty-day Lenten fast. Even after infant baptism became the norm and the catechumenate faded, the Lenten fast remained — reinterpreted as a season of renewal for the whole church.

Fasting in Acts: Mission, Elders, and the Spirit

The church at Antioch was worshiping and fasting when the Spirit commissioned the first missionary journey of Paul. The pattern repeated at every ordination:

In the early church, fasting was a regular companion of major decisions. Setting apart missionaries, ordaining elders, commissioning leaders — all were marked with fasting. Fasting was understood as a way of making the church more attentive to the Spirit's voice and more dependent on God's provision.

Marriage, Devotion, and 1 Corinthians 7

Paul assumed that married couples might, by mutual agreement, set aside marital relations for a season of prayer and fasting — but he cautioned that such seasons should be brief and followed by resuming normal relations. The principle is consistent: fasting is a temporary intensification, not a permanent lifestyle of deprivation.

The Rise of Lent and Monastic Fasting

By the second century, churches had begun to observe a fast before Easter. Originally this was a two-day (Good Friday and Holy Saturday) fast; by the third century it had grown to a week; and by the Council of Nicaea in 325 AD, a forty-day fast (Lent) was the established pattern across most of the church. Forty days mirrored Christ's wilderness fast.

With the rise of monasticism in the fourth century — Anthony of Egypt (c. 251–356 AD), Pachomius, Basil the Great, and John Chrysostom — fasting intensified. Desert monks ate once a day, often only bread and salt, and sometimes went days without food. Athanasius wrote that "fasting kills the sins of the flesh." Monastic fasting shaped the ascetic tradition that influenced both Catholic and Orthodox spirituality for centuries.

The Witness of the Early Fathers

The post-apostolic fathers echo the Didache's insistence that fasting belongs to normal Christian life. The Shepherd of Hermas (early second century) commands a particular fast: eat only bread and water, and give the money you would have spent on food to the poor — a direct application of Isaiah 58. Tertullian of Carthage (c. 155–220 AD) wrote a treatise On Fasting defending the practice against critics who thought it too Jewish. Augustine of Hippo (354–430 AD) preached regularly on Lenten fasting, insisting that what we withhold from ourselves should be given to those who lack.

These witnesses are consistent on two points. First, Christian fasting is not a hunger strike to earn God's favor; it is an act of dependence that opens the soul to grace. Second, fasting and almsgiving go together — the money saved on food becomes provision for the poor, fulfilling Isaiah 58's vision of a fast that loosens injustice.

Through the Reformation and Beyond

The Protestant Reformers of the sixteenth century rejected the medieval Catholic penitential system in which fasting had sometimes been treated as a meritorious work, but they did not abandon the practice. Martin Luther fasted regularly, sometimes for days at a time. John Calvin's Ecclesiastical Ordinances for Geneva (1541) prescribed fasts for the whole city in times of crisis. The 39 Articles of the Church of England (1571) list 'fasting' among the legitimate rites of the church.

In the eighteenth century, John Wesley so valued the early-church pattern that he refused to ordain a Methodist preacher who did not fast on Wednesdays and Fridays. The Puritans in New England called days of fasting and humiliation in seasons of drought, plague, or war — a practice that shaped American civic religion well into the nineteenth century. The point is continuity: from the apostles through the Reformers and into the modern church, fasting has never disappeared from Christian practice.

What We Inherit

• Weekly Wednesday and Friday fasts, anchored in the passion of Christ.
• Fasting before baptism, both for candidates and for the baptizers.
• Fasting at ordination, commissioning, and major decisions.
• A forty-day pre-Easter fast that became Lent by the fourth century.
• Monastic traditions of simple, limited eating.
• Mutual, time-limited fasting in marriage for focused prayer (1 Corinthians 7:5, ESV).

Fasting Today: An Inherited Rhythm

Contemporary Christians who fast stand in a stream that flows from the apostles, through the Didache, through Lent, through the monasteries, through the Reformers, and into the present. A weekly Wednesday or Friday fast, a Daniel-style partial fast for a season, or a 16:8 eating window offered to God — all are heirs of the early church's conviction that the body is part of devotion, not a distraction from it.

For those who keep a daily fasting window, simple drinks like water, black coffee, plain tea, or yerba mate make the practice sustainable without breaking the fast. The early church's rhythms were never about exotic deprivation; they were about ordering appetites around the gospel. Two thousand years later, that ordering still works.