Consecrated host

In Paul Turner's Blog by Paul Turner

Q:  Kindly remind me what is the significance of the priest breaking off a tiny fragment of the consecrated host and placing it in the chalice during the communion rite?

Thanks!

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A:  I covered this in my book, Let Us Pray.

GIRM 83 says it signifies “the unity of the Body and Blood of the Lord in the work of salvation, namely of the Body of Jesus Christ, living and glorious.”