Concern (-eth) - Vine's Expository Dictionary of New Testament Words
Concern (-eth)* 1. The neuter plural of the article (the things"), with the genitive case of a noun, is used in 2 Corinthians 11:30 of Paul's infirmity, "the things that concern my infirmity," lit., "the (things) of my infirmity."
* 2. The neuter singular of the article, with the preposition peri, "concerning," is used by the Lord in Luke 22:37, "that which concerneth," lit., "the (thing) concerning (Me)." The same construction is found in Luke 24:27; Acts 19:8; Acts 28:31