In the Catholic Church, there is a tradition of praying before and after communion, reflecting on the mystery that is received.
It is a tradition that appears to have ancient roots, such as this prayer by Pectorius of Autun.
The prayer was found as an inscription on a marble tablet, and highlights the early faith of Christians in the Eucharist and how they would sometimes use cryptic language in their messages.
The prayer uses the word "fish" in place of Jesus or the Eucharist and relates an early Christian tradition of receiving the Eucharist in the hands.