1 Corinthians 6:17

But he that is joined unto the Lord is one spirit.

Cross References

John 17:21-23 That they all may be one; as thou, Father, art in me, and I in thee, that they also may be one in us: that the world may believe that thou hast sent me. And the glory which thou gavest me I have given them; that they may be one, even as we are one: I in them, and thou in me, that they may be made perfect in one; and that the world may know that thou hast sent me, and hast loved them, as thou hast loved me.
John 3:6 That which is born of the flesh is flesh; and that which is born of the Spirit is spirit.
1 Corinthians 12:13 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.
Ephesians 4:3-4 Endeavouring to keep the unity of the Spirit in the bond of peace. There is one body, and one Spirit, even as ye are called in one hope of your calling;
Ephesians 5:30 For we are members of his body, of his flesh, and of his bones.
Philippians 2:5 Let this mind be in you, which was also in Christ Jesus: