Council of Trent: Session XXIII, Reformation, Chapter VII

CHAPTER VII. Those to be ordained are to be examined by persons versed in divine and human laws.

The holy Synod, adhering to the traces of the ancient canons, ordains, that when a bishop has arranged to hold an ordination, all who may wish to be received into the sacred ministry shall be summoned to the city, for the Thursday before the said ordination, or for such other day as the bishop shall think fit. And the bishop, calling to his assistance priests and other prudent persons, well skilled in the divine law, and of experience in the constitutions of the church, shall diligently investigate and examine the parentage, person, age, education, morals, learning, and faith of those who are to be ordained.

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