'Concerning' in the Bible

Jesus saw Nathanael coming toward Him, and said of him, “Here is an Israelite indeed [a true descendant of Jacob], in whom there is no guile nor deceit nor duplicity!”

and He did not need anyone to testify concerning man [and human nature], for He Himself knew what was in man [in their hearts—in the very core of their being].

There is another [My Father] who testifies about Me, and I know [without any doubt] that His testimony on My behalf is true and valid.

And the Father who sent Me has Himself testified about Me. You have never heard His voice nor seen His form [His majesty and greatness—what He is like].

So the crowd was divided because of Him.

I am One [of the Two] who testifies about Myself, and My Father who sent Me testifies about Me.”

Jesus answered them, “I have told you so, yet you do not believe. The works that I do in My Father’s name testify concerning Me [they are My credentials and the evidence declaring who I am].

and many of the Jews had come to see Martha and Mary, to comfort them concerning [the loss of] their brother.

For I have never spoken on My own initiative or authority, but the Father Himself who sent Me has given Me a commandment regarding what to say and what to speak.