'Concerning' in the Bible

Concerning Him we have much to say, and much that it would be difficult to make clear to you, since you have become so dull of apprehension.

By people who live on milk I mean those who are imperfectly acquainted with the teaching concerning righteousness.

But we, even while we speak in this tone, have a happier conviction concerning you, my dearly-loved friends--a conviction of things which point towards salvation.

Then I said, 'I have come--in the roll of the book it is written concerning Me--to do Thy will, O God.'"