1 Timothy 3:10

Let these also (The word also implies that the same rule was to be observed with relation to bishops) first be proved “By the examination,” says Whitby, “of the soundness of their faith, and the purity of their former lives: and then let them be admitted to use the office of a deacon, being thus found blameless.” And he shows, by a quotation from the Life of the Emperor Severus, written by Lampridius, and from the epistles of Cyprian, that such an examination was used at the ordination of both bishops and deacons in the churches of the early Christians, and that it was a practice derived from the apostles. Some, however, think that the apostle required, in this direction, that no one should be made either a bishop or a deacon, till he had given proof both of his steadfastness in the faith, and of his genuine piety and good conduct during a reasonable space of time after his conversion: or, that the persons admitted to these offices should be under trial for a while, how they conducted themselves therein, and then afterward, if they gave satisfaction, they should be confirmed in them.