Gregory the Great — as excerpted in the Catena Aurea on Matthew 10:5-8

“(ubi sup.) Miracles also were granted to the holy preachers, that the power they should shew might be a pledge of the truth of their words, and they who preached new things should also do new things; wherefore it follows, Heal the sick, raise the dead, cleanse the lepers, cast out dæmons.”