Canon 12 (10)
And because of the many machinations of the treacherous people who bring doubt upon private donations given to the Church of God, in accordance with the decree of the preceding pontiffs, it is appropriate that it be inviolably observed that the testaments or donations, or other kinds of documents, which bishops, presbyters, or the clerics of lower ranks produce out of their [free] will, whereby they seem to give something to the Church or some person, should always be firmly upheld. We decree in particular that, although the will of some ecclesiastics could be seen as being contrary to secular law, sometimes out of necessity, sometimes for the sake of simplicity, the will of the dead should nevertheless remain unchanged and fully observed with God's grace. If someone, paying no heed to his soul, dares to alienate some of this property, he should be considered separated from the ecclesiastical community and communion with all Christians up to the time of his correction and restitution of the things he has stolen.
(trans. J. Szafranowski)