From the Homily of the Sixth Sunday After Trininty Gospel of Matthew v. 20
The ancient liturgy as recorded by Justin Martyr included a form for the functions that Jesus taught in the Gospel reading. We read in the Apostlic Teaching and Constitution" that the Prayers included a confession, and absolution was assured before one presented themselves and their gifts. After the Prayers, there was a time for the exchange of the Peace before the Communion of the faithful.
The Order of Centurions, and many churches, use this ancient form. Regardless of what form your congregation may use, before presenting yourself for Communion, ensure that you examine yourself. Recognize where you have fallen short of the righteousness to which Jesus calls us. Repent and confess your sins to God and be assured of his forgiveness. Reconcile with your neighbor if needed, and exchange the Peace of God with your neighbors. Come to God's altar with the assurance that through Jesus you are forgiven and cleansed of all unrighteousness, and partake of the Body and Blood of our Lord Jesus Christ which was given and shed for you and for many for the remission of sins.
Visit the Order at www.OrderofCenturions.org