When it is said
In the Gelasian Sacramentary the prayer to forgive our neighbours is said after Communion, at a Mass that asks for love. The prayer to repay good for evil is the second prayer of the next Mass.
Here they stand the other way round, with an Amen at the end. Both are short enough to pray anywhere, whenever someone has wronged you.
Where it comes from
No author known
Where they come from
Both prayers come from the Gelasian Sacramentary, a book of the Roman Church’s Mass prayers. Its one surviving copy was probably made near Paris about AD 750, from older prayers of the church at Rome. No one knows who wrote them.
The Cult of Saints in Late Antiquity, University of Oxford, record E07005; H. A. Wilson, The Gelasian Sacramentary (Oxford, 1894), pages 247 and 248
An older form
Both prayers are already in the Leonine Sacramentary, an older book of Roman Mass prayers. Its manuscript at Verona was written early in the 600s. There the prayer to repay good for evil opens simply on God the Father, without the words about creation and redemption. It also ends with one more line, which asks that God’s servants long for their enemies to be set right rather than delight in revenge.
C. L. Feltoe, Sacramentarium Leonianum (Cambridge, 1896), pages 63 and 76
The Scripture in it
For at just the right time, while we were still powerless, Christ died for the ungodly. Very rarely will anyone die for a righteous man, though for a good man someone might possibly dare to die. But God proves His love for us in this: While we were still sinners, Christ died for us.
Do not repay evil with evil or insult with insult, but with blessing, because to this you were called so that you may inherit a blessing.
And forgive us our debts, as we also have forgiven our debtors. And lead us not into temptation, but deliver us from the evil one.’
Bible text: Berean Standard Bible, public domain.
In Latin
Deus, qui quum omnes creaturas diligens feceris,
in eam indulgentiam hominem,
ut etiam illum ab impietatibus redimeres, condidisti,
da servis tuis hunc caritatis affectum,
ut bona pro malis rependere tuo incitentur exemplo.
Per.
Libera nos, Domine, ab omni malo,
propitiusque concede
ut quae nobis poscimus relaxari,
ipsi quoque proximis remittamus.
Per.
From H. A. Wilson, The Gelasian Sacramentary (Oxford, 1894), pages 247 and 248.