Some of the most serious sins against God are committed in corrupt worship. Nadab and Abihu, the sons of Aaron, were killed by the Lord as they conducted their priestly duties in the Tabernacle. Why? Because they diverted from God's clear instructions and burned incense that He had not authorized. In this message, John MacArthur compares this to the modern Charismatic Movement and the false teachers who have introduced strange fire into God's holy worship.