What the Bible says about Fire as Punishment
(From Forerunner Commentary)
No one knows for sure exactly what occurred, but somewhere on the outskirts of the camp of Israel a literal fire broke out. Whether it was started by lightening or fire out of heaven, nobody knows, only that it was from the Lord. The fire began to consume part of the camp. Soon, people began to experience pain as a result.
John W. Ritenbaugh
Passover and I Corinthians 10