Revelation 19:21

Modern King James Version

And the rest were slain by the sword of Him who sat on the horse, it proceeding out of His mouth. And all the birds were filled from their flesh.

Cross References

Revelation 1:16

And He had seven stars in His right hand, and out of His mouth went a sharp two-edged sword. And His face was like the sun shining in its strength.

Revelation 17:16

and the ten horns which you saw on the beast, these will hate the harlot and will make her desolate and naked. And they will eat her flesh and burn her with fire.