'Concerning' in the Bible

For the word of the Lord has resounded from you and has echoed [like thunder], not only in Macedonia and Achaia, but in every place [the news of] your [great] faith in God has spread, so that we never need to say anything about it.

For they themselves report about us, telling what kind of reception we had among you, and how you turned to God from idols to serve the living and true God,

Now concerning brotherly love, you have no need for anyone to write you, for you have been [personally] taught by God to love one another [that is, to have an unselfish concern for others and to do things for their benefit].