'In Christ' in the Bible

I am; for I am not like most, trafficking in the word of God, but rather from a sincere heart, like a man of God, I speak in Christ, in the very presence of God.

Nay, their minds were made dull; for to this very day, at the public reading of the Old Testament, the same veil rests thereon, because it is not revealed to them that in Christ the veil is taken away.

So there is a new creation when any man is in Christ. The old life has passed away, behold, the new is come.

how that God was in Christ reconciling a world to himself, not reckoning to men their trespasses; and that to me he has entrusted the message of that reconciliation.

Do you think that all this time I am defending myself to you? It is before the presence of God that I am speaking in Christ; and all, beloved, for your upbuilding.