Verily. See note on Matthew 5:18.
If ye have faith, &c. This is the third occasion that this was repeated. The first was in Matthew 17:20; Mark 11:23. and the second in Luke 17:6. The condition is quite hypothetical. See App-118.
doubt. App-122.
Be thou removed, &c. It was. common proverb to say of. great teacher, who removed difficulties, that he was "a rooter up of mountains". See note on Luke 17:6.