'In the Spirit' in the Bible

For I, for my part, though absent in the body, yet present in the spirit have already determined, as if I were present with you, respecting him who thus wrought this deed,

And such were some of you; but ye were washed, but ye were made holy, but ye were accepted as righteous in the name of the Lord Jesus, and in the Spirit of our God.

For he that speaketh in an [unknown] tongue speaketh not to men, but to God; for no one heareth; but in the Spirit he speaketh mysteries;