There are three other texts for dismissal that are new in the third edition of the Roman Missal. The bishops at the 2005 Synod on the Eucharist had proposed that, in order to “make more explicit the relationship between Eucharist and mission … new dismissal formulas be prepared … which underline the mission in the world of the faithful who have participated in the Eucharist.” Pope Benedict XVI approved this suggestion and selected three new formulas for dismissal.The last option for the dismissal is not really new; it is the recovery of an ancient formula, “Depart in peace”, found in the late-fourth-century Apostolic Constitutions.
Go in peace. Jg 18:6; Isa 55:12; Lk 2:29; 7:50; 8:48This recalls once more (as did several prayers during the Communion Rite) the peace that Christ gave to His Apostles on the day of His Resurrection. He gave them peace and told them that He was sending them as He had been sent by His Father. This means that the Church’s mission is the Son’s mission: to preach the Gospel, to call all men to repentance, and to lead them to salvation and eternal life.
This attitude of Christian peace is how we are sent out: “Whatever house you enter, first say, ‘Peace be to this house!’ And if a son of peace is there, your peace shall rest upon him; but if not, it shall return to you.” (Lk 10:5-6)