Theophylact of Ohrid — as excerpted in the Catena Aurea on Mark 16:14-18

“Or else; to every creature, that is, whether believing or unbelieving. It goes on: He that believeth and is baptized shall be saved. For it is not enough to believe, for he who believeth and is not baptized, but is a catechumen, has not yet attained to perfect salvation.”