A sword

I made mention of this in my video!

Matthew 10:34 King James Version (KJV)
34 Think not that I am come to send peace on earth: I came not to send peace, but a sword.

Hebrews 4:12 King James Version (KJV)
12 For the word of God is quick, and powerful, and sharper than any twoedged sword, piercing even to the dividing asunder of soul and spirit, and of the joints and marrow, and is a discerner of the thoughts and intents of the heart.