The Messiah's words would be as sharp as a two-edged sword.
OT Prophecy NT Fulfillment
Isaiah 49:2a
[2] And he hath made my mouth like a sharp sword; in the shadow of his hand hath he hid me, and made me a polished shaft; in his quiver hath he hid me.
Revelation 2:12–16
[12] And to the angel of the church in Pergamos write; These things saith he which hath the sharp sword with two edges;
[13] I know thy works, and where thou dwellest, even where Satan's seat is: and thou holdest fast my name, and hast not denied my faith, even in those days wherein Antipas was my faithful martyr, who was slain among you, where Satan dwelleth.
[14] But I have a few things against thee, because thou hast there them that hold the doctrine of Balaam, who taught Balac to cast a stumblingblock before the children of Israel, to eat things sacrificed unto idols, and to commit fornication.
[15] So hast thou also them that hold the doctrine of the Nicolaitanes, which thing I hate.
[16] Repent; or else I will come unto thee quickly, and will fight against them with the sword of my mouth.

John 12:48
He that rejecteth me, and receiveth not my words, hath one that judgeth him: the word that I have spoken, the same shall judge him in the last day.
Tanakh – Neviim – Isaiah 49:2a
[49:2] And He hath made my mouth like a sharp sword, in the shadow of His hand hath He hid me; and He hath made me a polished shaft, in His quiver hath He concealed me.
Hebrew OT – Isaiah 49:2a
[49:2] וַיָּשֶׂם פִּי כְּחֶרֶב חַדָּה
בְּצֵל יָדוֹ הֶחְבִּיאָנִי
וַיָּשִׂימֵנִי לְחֵץ בָּרוּר
בְּאַשְׁפָּתוֹ הִסְתִּירָנִי