1 Corinthians 6:17

But he being joined to the Lord is one spirit.

John 17:21-23

that they all may be one, as You, Father, are in Me, and I in You, that they also may be one in Us, so that the world may believe that You have sent 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 also by one Spirit we are all baptized into one body, whether Jews or Greeks, whether bond or free, even all were made to drink into one Spirit.

Galatians 2:20

I have been crucified with Christ, and I live; yet no longer I, but Christ lives in me. And that life I now live in the flesh, I live by faith toward the Son of God, who loved me and gave Himself on my behalf.

Ephesians 4:3-4

endeavoring to keep the unity of the Spirit in the bond of peace.

Ephesians 5:30

For we are members of His body, of His flesh, and of His bones.

Philippians 2:5

For let this mind be in you which was also in Christ Jesus,

Treasury of Scripture Knowledge

Summary

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

Bible References

General references

1 Corinthians 12:13
For also by one Spirit we are all baptized into one body, whether Jews or Greeks, whether bond or free, even all were made to drink into one Spirit.
John 3:6
That which is born of the flesh is flesh, and that which is born of the Spirit is spirit.
John 17:21
that they all may be one, as You, Father, are in Me, and I in You, that they also may be one in Us, so that the world may believe that You have sent Me.
Ephesians 4:3
endeavoring to keep the unity of the Spirit in the bond of peace.
Ephesians 5:30
For we are members of His body, of His flesh, and of His bones.
Philippians 2:5
For let this mind be in you which was also in Christ Jesus,