Understanding the Liturgical Worship Service: Service of the Sacrament Part IV

(Before I begin, let me give a quick plug: I've started another blog to not keep up on; this one will only be presenting less familiar hymns, as well as alternative translations to familiar ones. Most of these will be by other folks, although I might alter a few things, since these hymns are in public domain (i.e. older). Hopefully it will be more devotional and less academic/controversial.)

Words of Institution

Explanation: These are the very words that Jesus said when He instituted the Sacrament of Holy Supper. "Because the Words (verba) of Institution are the very heart of the sacramental action, they should always be employed. It is through Christ's word and its power, not through the action of the celebrant, that Christ's body and blood are present in the bread and wine." (Theology and Practice of The LORD'S SUPPER, CTCR Doc, 1983).
Sacramental: The are Christ's very words.
Scripture: Matt 26:26-28, Luke 22:19-20, I Cor 11:23-25
Alternative: Some chant this, some just speak it. I suppose having soft piano music in the background (like some do during prayers) might be okay, but this can very easily become distracting, so care should be taken.

Pax Domini

Explanation: Pax Domini means "The peace of the Lord." When the risen Christ first physically appeared to His apostles in the upper room, He greeted them by saying, "Peace be with you." In the same way, Christ is about to physically appear to us in, with, and under the forms of bread and wine.
Sacramental: Christ gives us His peace.
Scripture: Judges 6:23, John 20:19-20, Romans 5:1-2
Alternatives: Some congregations "share the peace" with each other at this time. It's slightly disruptive, but it's a liturgical answer to just greeting each other before the first hymn.
Hymns: no

Agnus Dei

Explanation: This song, spoken by John the Baptist in John 1, has been in use since the 8th Century, maybe even earlier. Thrice we call upon the Lamb of God to hear us, have mercy on us, and take our sins away. This is an illusion to the Exodus of the folk of Israel, where a first-born, spotless lamb was sacrificed, it's blood painted on door frames, and eaten by the household, so that their lives would be spared. Likewise, Christ lived a spotless (free of sin) life, was sacrificed on the cross, His blood placed on the door frame of our hearts (figuratively speaking), and eaten in the forms of bread and wine. Therefore, our eternal lives are spared. In this manner, He "grant(s) us peace."
Sacramental: We sing the words of Scripture back to God.
Scripture: Exod 12:1-23, I Cor 5:7b, I Pet 1:19-20
Alternative: Michael W. Smith has a song called "Agnus Dei," but the text is different. I'm not aware of any other versions.
Hymns: The only hymn version I know is found in the DS IV in LSB.