[AFRICANUS libro octauo quaestionum. ] §17.1.37.prHominem certum pro te dari fideiussi et solui: cum mandati agatur, aestimatio eius ad id potius tempus, quo solutus sit, non quo agatur, referri debet, et ideo etiamsi mortuus fuerit, nihilo minus utilis ea actio est.
[AFRICANUS, Questions, Book VIII.] I became surety for you that a certain slave should be given, and I paid [him]. When an action on mandate is brought, the valuation of the slave must be referred to the time when he was paid, rather than when the action is brought; and therefore, even if he has died, that action is nonetheless effective.
aliter in stipulatione seruatur: nam tunc id tempus spectatur quo agitur, nisi forte aut per promissorem steterit, quo minus sua die solueret, aut per creditorem, quo minus acciperet: etenim neutri eorum frustratio sua prodesse debet.
It is observed otherwise in a stipulation; for in that case, the time when the action is brought is regarded, unless by chance it was due to the promisor that he did not pay on his day, or due to the creditor that he did not accept; for indeed, to neither of them ought their own delay to be of advantage.