Holy Thursday: The Mass of the Lord's Supper Explained
What happens at the Holy Thursday liturgy, why the priest washes feet, and how Catholics keep watch at the altar of repose.
Holy Thursday evening marks the start of the Sacred Triduum, the three holiest days of the Church year. On this night, Catholics gather for the Mass of the Lord's Supper to remember what Jesus did in the Upper Room: he washed his disciples' feet, gave them his Body and Blood in the Eucharist, and established the priesthood. If you have never attended this liturgy, or if you want to understand what you are seeing, this guide walks through each part of the evening.
What Happened in the Upper Room
On the night before he died, Jesus shared a Passover meal with his twelve apostles in Jerusalem. During the meal, he took bread, blessed it, broke it, and said, 'This is my body, which will be given up for you.' He did the same with a cup of wine: 'This is my blood of the new covenant.' Catholics believe this was the first Eucharist, the moment Jesus gave the Church its central act of worship. He then told the apostles, 'Do this in remembrance of me,' words the Church understands as establishing the ordained priesthood. Every Mass since then carries forward what began that night.
The Washing of the Feet
Before the meal, Jesus wrapped a towel around his waist and knelt to wash his disciples' feet. In first century Palestine, this was the work of the lowest household servant. Peter objected, but Jesus insisted: 'If I, your Lord and Teacher, have washed your feet, you also ought to wash one another's feet' (John 13:14). During the Holy Thursday liturgy, the priest reenacts this gesture, washing the feet of parishioners chosen from the congregation. It is a visible reminder that Christian authority means service, not status. Pope Francis has made a point of washing the feet of prisoners, refugees, and people outside the Church to underscore that message.
The Transfer and the Altar of Repose
After Communion, the remaining consecrated hosts are carried in procession to a side chapel or decorated space called the altar of repose. The tabernacle on the main altar is left open and empty. The altar is stripped bare, candles are removed, and the church falls quiet. This is not a funeral. It is a re-creation of the movement from the Upper Room to the Garden of Gethsemane, where Jesus asked his closest friends to stay awake and pray with him. Many parishes keep the altar of repose open for adoration late into the night, and the faithful are invited to spend time there in silence.
The Seven Churches Tradition
In many Catholic cultures, especially in Italy, the Philippines, and Latin America, there is a custom of visiting seven churches on Holy Thursday night. At each stop, the faithful pray before that parish's altar of repose. The number seven recalls the seven places Jesus was taken during his Passion, from the Upper Room to Calvary. In cities with many Catholic parishes close together, groups walk from church to church, often finishing well after midnight. Even if you only visit your own parish, spending time before the altar of repose connects you to this centuries-old practice of keeping watch with Christ.