Blessing at the Close of Mass

From the Book of Divine Worship - Holy Matrimony - Rite One.

Immediately before the Blessing of the People, the Priest, facing the Bridegroom and Bride, the Man and Woman kneeling, shall bless them, saying,

God the Father, God the Son, God the Holy Ghost, + bless, preserve, and keep you; the Lord mercifully with his favor look upon you, and fill you with all spiritual benediction and grace; that ye may so live together in this life, that in the world to come ye may have life everlasting. Amen.

If Matrimony be solemnized apart from the Mass, all shall be done as above until the Liturgy of the Eucharist. In the stead thereof shall be said the Lord's Prayer, the Nuptial Blessing, and the Blessing at the Close of Mass.