Council of Trent: Session XXIII, Reformation, Chapter XVI

CHAPTER XVI. Those who are ordained shall be assigned to a particular church.

Whereas no one ought to be ordained, who, in the judgment of his own bishop, is not useful or necessary for his churches, the holy Synod, adhering to the traces of the sixth canon of the council of Chalcedon, ordains, that no one shall for the future be ordained without being attached to that church, or pious place, for the need, or utility of which he is promoted; there to discharge his duties, and not wander about without any certain abode. And if he shall quit that place without consulting the bishop, he shall be interdicted from the exercise of his sacred (orders). Furthermore, no cleric, who is a stranger, shall, without letters commendatory from his own Ordinary, be admitted by any bishop to celebrate the divine mysteries, and to administer the sacraments.

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