1 Corinthians 6:17
"But he that is joined unto the Lord is one spirit."
Cross References (ranked by relevance)
I am crucified with Christ: nevertheless I live; yet not I, but Christ liveth in me: and the life which I now live in the flesh I live by the faith of the Son of God, who loved me, and gave himself for me.
For by one Spirit are we all baptized into one body, whether we be Jews or Gentiles, whether we be bond or free; and have been all made to drink into one Spirit.
That which is born of the flesh is flesh; and that which is born of the Spirit is spirit.
For we are members of his body, of his flesh, and of his bones.
Let this mind be in you, which was also in Christ Jesus: