[GAIUS libro uicesimo tertio ad edictum prouinciale. ] §42.5.7.prHereditarium aes alienum intellegitur etiam id, de quo cum defuncto agi non potuit, ueluti quod is cum moreretur daturum se promisisset, item quod is, qui pro defuncto fideiussit, post mortem eius soluit.
[GAIUS, on the Provincial Edict, book 23] Inheritance debt is understood to include also that on which an action could not be brought against the deceased, for example, that which he had promised he would give when he was dying, and likewise that which he who guaranteed for the deceased paid after his death.