This is such a special Feast. It used to be celebrated on a Thursday and the Blessed Sacrament was carried in procession. Now, we are grateful here that we have a Communion service as we still have no priest for Mass.
Here is the Collect for the Mass:
O God, who in this wonderful Sacrament have left us a memorial of your Passion, grant us, we pray, so to revere the sacred mysteries of your Body and Blood that we may always experience in ourselves the fruits of your redemption.
This feast has a sequence Lauda Sion which has many verses. There is a shorter form that begins with this verse:
Lo! the angel's food is given
To the pilgrim who has striven;
See the children's bread from heaven,
which on dogs may not be spent.
(It sounds better in Latin!)
Jesus told us, "I am the living bread that came down from heaven;l whoever eats this bread will live forever; and the bread that I will give is my flesh for the life of the world."
That is the first of the Gospel for this feast, John 5:51-58