[IDEM libro trigesimo sexto digestorum. ] §34.3.11.prSi debitor fideiussorem suum ab herede suo liberari iusserit, an fideiussor liberari debeat? respondit debere.
[The same, in the thirty-sixth book of the Digests.] If a debtor has ordered that his surety be released by his heir, must the surety be released? He answered that he must.
item quaesitum est, an, quia mandati actione heredes tenerentur, inutile legatum esset, quemadmodum inutile legatum est quod debitor creditori suo legat.
Likewise, the question was asked whether, because the heirs would be liable to an action of mandate, the legacy was useless, just as a legacy which a debtor leaves to his creditor is useless.
respondit, quotiens debitor creditori suo legaret, ita inutile esse legatum, si nihil interesset creditoris ex testamento potius agere quam ex pristina obligatione.
He answered that, whenever a debtor makes a legacy to his creditor, the legacy is useless only if it is of no interest to the creditor to sue under the will rather than under the original obligation.
nam et si Titius mandauerit Maeuio, ut pecuniam promitteret, deinde liberari eum iusserit a stipulatore, manifestum est, quantum intersit promissoris liberari potius quam praestare ex stipulatu, deinde mandati agere.
For even if Titius mandated Maevius to promise money, and then ordered that he be released by the stipulator, it is clear how much it is in the interest of the promisor to be released rather than to perform under the stipulation and then bring an action of mandate.