Pro deo amur et pro christian poblo et nostro commun salvament, d’ist di in avant, in quant deus savir et podir me dunat, si salvaraeio cist meon fradre Karlo et in aiudha et in cadhuna cosa, si cum om per dreit son fradra salvar dist, in o quid il mi altresi fazet, et ab Ludher nul plaid numquam prindrai, qui meon vol cist meon fradre Karle in damno sit.¹

When Louis had finished, Charles took the oath in the lingua teudisca:

In godes minna ind in thes christânes folches ind unsêr bêdhero gehaltnissî, fon thesemo dage frammordes, sô fram sô mir got geuuiczi indi mahd furgibit, sô haldih thesan minan bruodher, sôso mit rehtu sînan bruodher scal, in thiu thaz er mig sô sama duo, indi mit Ludheren in moheiniu thing ne gagango, the mînan uuilon imo ce scadhen uuedhên.²

And this is the oath which the followers of each took in their own tongues:

Lingua romana:
Si Lodhuuigs sagrament, que son fradre Karlo iurat, conservat, et Karlus meos sendra de suo part non los tanit, si io returnar non l’int pois: ne io ne neuls, cui eo returnar int pois, in nulla aiudha contra Lodhuuuig nun li iv er.³

²This oath is the same as that given by Louis, except that the names are reversed.

³If Louis keeps the oath which he swore to his brother Charles, and Charles, my lord, on his part does not keep it, if I cannot prevent it, then neither I nor anyone whom I can prevent shall ever defend him against Louis.