A while back, likely a few years ago, Bishop David mentioned the existence of a very old hymn that was said during the Distribution of the Holy Mysteries during one of his weekly sessions.
Apparently, this hymn/melody was instituted in order to dissuade the unworthy from partaking of the Holy Communion. His Grace mentioned that due to its harsh nature, the melody was avoided over time to the point where we now do not say it at all.
If anyone is aware of what the melody is called, and more specifically how to access its words, I would love to know! (@minatasgeel maybe?!)