two-edged sword

The "two-edged sword" appears to be a reference to God's word. It is the standard by which God judges.

For the word of God is living and active, and sharper than any two-edged sword, even penetrating as far as the division of soul and spirit, of both joints and marrow, and able to judge the thoughts and intentions of the heart. (Heb 4:12).

From Revelation: An Explication © A resource for learning how to read the Bible.