'Concerning' in the Bible

And while the child's father and mother were wondering at the words of Symeon concerning Him,

He will give orders to His angels concerning thee, to guard thee safely;'

When John's messengers were gone, He proceeded to say to the multitude concerning John, "What did you go out into the Desert to gaze at? A reed waving in the wind?

And He said to them, "This is what I told you while I was still with you--that everything must be fulfilled that is written in the Law of Moses and in the Prophets and the Psalms concerning me."