[ULPIANUS libro quadragensimo septimo ad Sabinum. ] §17.1.21.prCum mandatu alieno pro te fideiusserim, non possum aduersus te habere actionem mandati, quemadmodum qui alienum mandatum intuitus spopondit.
[ULPIANUS in his forty-seventh book on Sabinus.] When I have become surety for you by another's mandate, I cannot have an action of mandate against you, just like one who, having regard to another's mandate, has made a promise.
sed si non utique unius, sed utriusque mandatum intuitus id fecerim, habebo mandati actionem etiam aduersus te, quemadmodum, si duo mihi mandassent ut tibi crederem, utrumque haberem obligatum.
But if I did this having regard not merely to the mandate of one, but of both, I shall have an action of mandate also against you, just as, if two had mandated me to extend credit to you, I would have both obligated.