New International Version
If anyone tries to harm them, fire comes from their mouths and devours their enemies. This is how anyone who wants to harm them must die.

American Standard Version
And if any man desireth to hurt them, fire proceedeth out of their mouth and devoureth their enemies; and if any man shall desire to hurt them, in this manner must he be killed.

Berean Study Bible
If anyone wants to harm them, fire proceeds from their mouths and devours their enemies. In this way, anyone who wants to harm them must be killed.

Douay-Rheims Bible
And if any man will hurt them, fire shall come out of their mouths, and shall devour their enemies. And if any man will hurt them, in this manner must he be slain.

English Revised Version
And if any man desireth to hurt them, fire proceedeth out of their mouth, and devoureth their enemies: and if any man shall desire to hurt them, in this manner must he be killed.

King James Bible
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.

World English Bible
If anyone desires to harm them, fire proceeds out of their mouth and devours their enemies. If anyone desires to harm them, he must be killed in this way.

Young's Literal Translation
and if any one may will to injure them, fire doth proceed out of their mouth, and doth devour their enemies, and if any one may will to injure them, thus it behoveth him to be killed.

Revelation 11:5 Additional Translations ...