John Trapp on Mark 16:16-17

Verse 16. He that beleeveth] That which you preach. And is baptized] As content to give up himself to Christ, and to receive his mark, making a publike profession of the faith. He that beleeveth not] He saith not, or, Is not baptized; for it is not the want, but the contempt of baptisme that damneth. Unbeleef is a bloudy sin, Heb. 10. 26. a heavie sin, Joh. 3. 19. a most ingratefull, inexcusable sinne, such as shuts a man up close prisoner in the dark dungeon of the Law, unto unavoydable destruction, Gal. 3. 23.