Bible Verses About Union With Christ: Our being in Christ

I know a man in Christ: above fourteen years ago (whether in the body, I know not, or out of the body, I know not: God knoweth), such a one caught up to the third heaven.

And we know that the Son of God is come. And he hath given us understanding that we may know the true God and may be in his true Son. This is the true God and life eternal.