Council of Trent: Session XXIII, Reformation, Chapter II

CHAPTER II. Those set over Churches shall receive the rite of consecration within three months; where the consecration is to take place.

Those who,--under whatsoever name or title, even though they be cardinals of the holy Roman Church,--have been set over cathedral, or superior, churches, if they shall not, within three months, have received the rite of consecration, shall be bound to restore the fruits which they have received; if they shall have neglected to do this within three other months afterwards, they shall be ipso jure deprived of their churches. And their consecration, if performed out of the Court of Rome, shall be celebrated in the church to which they have been promoted, or in the province, if it can be conveniently done.

Translation: J. Waterworth, The Canons and Decrees of the Council of Trent (1848), Hanover Historical Texts Project transcription (1995).