If you are at home, pray at the third hour and praise God. If you are elsewhere at that time, pray in your heart to God. For in that hour Christ was nailed to the wood. In the Old Testament the Law instructed that the shew bread was to be offered at the third hour as a symbol of the Body and Blood of Christ. And the sacrifice of the irrational lamb was a symbol of the perfect Lamb. For Christ is the Shepherd, and he is also the bread which descended from heaven.
- Hippolytus, Apostolic Tradition, 41:5,6