Revelation 11:5

if any man should offer to hurt them, fire will proceed out of their mouth, and destroy their enemies: whoever should hurt them, would by this means perish.

Acts 9:4-5

and he fell to the ground, and heard a voice which said to him, Saul, Saul, why persecutest thou me?

Treasury of Scripture Knowledge

Summary

And if any man will hurt them, fire proceedeth out of their mouth, and devoureth their enemies: and if any man will hurt them, he must in this manner be killed.

Fire

Bible References

Fire

Acts 9:4
and he fell to the ground, and heard a voice which said to him, Saul, Saul, why persecutest thou me?