In ancient Israel there lived two priests who approached God without the reverence He deserves. They disregarded God’s instructions and burned incense in His Tabernacle with “strange fire . . . which He had not commanded them. And fire came out from the presence of the Lord and consumed them, and they died before the Lord” (Lev. 10:2). Scripture calls us to worship the Lord in the beauty of holiness. Anything unholy — including false prophecy, phony miracles, religious hypocrisy, self-willed worship, or anything else of the sort — is a kind of “strange fire,” deserving of the most severe judgment. That is why pastor-teacher John MacArthur has written this treatise on a movement whose foundation and direction have betrayed the God they claim to represent.