The 40 Hour Passion Fast and the Black Fast

The Strictness of Holy Week

The Passion Fast is a term which refers to the fast which began for some as early as sunset on Holy Thursday and as late as 8 AM on Good Friday. No one was allowed to eat any food during that time until sunset on Holy Saturday, which – since most fasted for Communion – extended until the morning on Easter Sunday. It was often called a “40 Hours Fast” and represents the original Lenten fast. For those who were too weak to follow this fast the minimum fast at this time was that of xerophagiae.

Xerophagiae is a diet of simple, dry, uncooked food, such as raw nuts, bread, fruits, and vegetables. Fish and oil are not part of it and neither are flesh nor animal products. It was a precept to fast on these only during Holy Week by custom and/or decree until approximately the time of Pope St. Gregory the Great (reigned 590 – 604 AD), who mentions nothing of it. It may still have been a custom at that time but no mention of it is made in the Decretals of Gregory IX published in 1234.

The Black Fast

A commonly misunderstood aspect of fasting is the “black fast.” Is the Passion Fast a Black Fast? Is it the only Black Fast? What is the true definition of a black fast? And what is it not? The Catholic Encyclopedia from 1907 answers as follows:

This form of fasting, the most rigorous in the history of church legislation, was marked by austerity regarding the quantity and quality of food permitted on fasting days as well as the time wherein such food might be legitimately taken. 

This is based in practice on the fasting done by the Early Church and the Apostles. In practice, there are three criteria that make a fast a “black fast” as the Encyclopedia identifies:

In the first place more than one meal was strictly prohibited. At this meal flesh meat, eggs, butter, cheese, and milk were interdicted (Gregory I, Decretals IV, cap. vi; Trullan Synod, Canon 56). Besides these restrictions, abstinence from wine, especially during Lent, was enjoined (Thomassin, Traité des jeûnes de l'Église, II, vii). Furthermore, during Holy Week the fare consisted of bread, salt, herbs, and water (Laymann, Theologia Moralis, Tr. VIII; De observatione jejuniorum, i). Finally, this meal was not allowed until sunset. St. Ambrose (De Elia et jejunio, sermo vii, in Psalm CXVIII), St. Chrysostom (Homil. iv in Genesim), St. Basil (Oratio i, De jejunio) furnish unequivocal testimony concerning the three characteristics of the black fast. 

Hence a black fast is one that meets these criteria:

1. Only one meal a day

2. Complete abstinence from all meat and animal products

3. The one meal may only be consumed after sunset.

Consequently, it is not a total abstinence from all food and drink whatsoever that makes a fast a “black fast”. And it also does not mean that one eats only bread. Vegetables are certainly allowed at the meal. And the Passion Fast is one such Black Fast

Want to learn more about the history of fasting and abstinence? Check out the Definitive Guide to Catholic Fasting and Abstinence.