The Sacred Triduum (Holy Thursday, Good Friday, Holy Saturday: Easter Vigil)

The three days" are the most holy of the liturgical year because they commemorate the Institution of the Lord's Supper (Eucharist and Priesthood) in the Upper Room, with its mandatum/command to "wash the feet" of others in imitation of Jesus Christ; the Passion of the Lord, who suffered and died on the cross on Calvary for the sake of our salvation; and Holy Saturday, when we "vigil" in anticipation of the Easter joy that comes to the world through the Resurrection of Christ from the dead.