[ULPIANUS libro sexto decimo ad edictum. ] §6.2.14.prPapinianus libro sexto quaestionum scribit: si quis prohibuit uel denuntiauit ex casua uenditionis tradi rem, quae ipsius uoluntate a procuratore fuerat distracta, et is nihilo minus tradiderit, emptorem tuebitur praetor, siue possideat siue petat rem.
[ULPIAN on the Edict, book 16] Papinian writes in the sixth book of his Questions: if anyone has prohibited or given notice against the delivery, on the ground of sale, of a thing which had been sold by his agent with his own consent, and the agent has nevertheless delivered it, the praetor will protect the buyer, whether he is in possession or is seeking the thing.
sed quod iudicio empti procurator emptori praestiterit, contrario iudicio mandati consequetur: potest enim fieri, ut emptori res auferatur ab eo, qui uenire mandauit, quia per ignorantiam non est usus exceptione, quam debuit opponere, ueluti: 'si non auctor meus ex uoluntate tua uendidit. '
But what the agent has paid to the buyer under the action on purchase, he will recover by the counter-action on mandate; for it can happen that the thing is taken away from the buyer by the person who mandated its sale, because through ignorance the buyer did not use the exception which he ought to have opposed, such as: "unless my author sold it with your consent."