[PAULUS libro undecimo ad Sabinum. ] §17.1.20.prEx mandato apud eum qui mandatum suscepit nihil remanere oportet, sicuti nec damnum pati debet, si exigere faeneratam pecuniam non potuit.
[PAULUS in his eleventh book on Sabinus.] By virtue of a mandate, nothing ought to remain with him who undertook the mandate, just as he ought not to suffer loss if he could not collect the money he lent at interest.
§17.1.20.1Fideiussori negotiorum gestorum est actio, si pro absente fideiusserit: nam mandati actio non potest competere, cum non antecesserit mandatum.
An action for business management lies for a guarantor if he has guaranteed on behalf of an absent person; for an action of mandate cannot lie, since no mandate preceded.