[GAIUS libro uicensimo secundo ad edictum prouinciale. ] §48.15.4.prLege Fabia tenetur, qui sciens liberum hominem donauerit uel in dotem dederit, item qui ex earum qua causa sciens liberum esse acceperit, in eadem causa haberi debeat, qua uenditor et emptor habetur.
[GAIUS, Book XXII on the Provincial Edict.] Under the Fabian law, anyone who knowingly has given a free person as a gift or has given them as a dowry is held liable; likewise, anyone who, from any of those causes, has accepted them knowing that they are a free person, ought to be held in the same position as that in which a seller and a buyer are held.
idem et si pro eo res permutata fuerit.
The same also applies if a thing has been bartered for him.