fire and brimstone

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The punishment of hell.
• noun Vehement rhetoric, especially homiletic rhetoric describing or warning of the punishments of hell.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The traditional punishments of Hell.
• adjective Referencing the power or wrath of God.
• adjective pejorative Stereotypical descriptive for a charismatic clergyman who stresses the power or wrath of God, literal interpretation of the Bible and traditional punishments of Hell.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun (Old Testament) God's means of destroying sinners