Prayer to Jupiter
JupiterLivy reconstructs the words with which a fetial priest sealed the treaty between Rome and Alba. It is the oldest Roman formula of international law: the priest reads the terms from wax tablets, calls Jupiter to witness, and strikes a pig with a flint knife.
The ending is remarkable. "Then may Diespiter strike the Roman people as I strike this pig here today; and strike so much the harder as you are stronger and mightier." The oath does not ask for protection — it hands the god a weapon against the swearer's own people and then sets its calibration. The pig is not a sacrifice but a demonstration: look, this is how it is done, and do the same, in the proportion by which you exceed me.
Livy writes in the first century BC about the regal period, and there is no way to test whether he preserved a genuine formula or composed one. The language, however, is markedly older than his own.