1 Corinthians 6:17

but he that is attach'd to the Lord, is united to him by one and the same spirit.

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.

John 3:6

the cleansing of the body is only external, but the purification of the spirit is spiritual.

1 Corinthians 12:13

for by one spirit we have all been baptized, to be form'd into one body, whether Jews or Gentiles, slaves or free; and have been all made to drink of one spirit.

Galatians 2:20

I am crucified with Christ, it is not I that now live, but Christ that liveth in me; the life I have in this body I live by faith in the son of God, who loved me, and gave himself for me.

Ephesians 4:3-4

endeavouring to preserve the spiritual union by your affectionate attachment to one another.

Ephesians 5:30

of which we are the several parts constituting his body.

Philippians 2:5

for the same temper of mind ought to be in you as was 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 by one spirit we have all been baptized, to be form'd into one body, whether Jews or Gentiles, slaves or free; and have been all made to drink of one spirit.
John 3:6
the cleansing of the body is only external, but the purification of the spirit is spiritual.
John 17:21
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.
Ephesians 4:3
endeavouring to preserve the spiritual union by your affectionate attachment to one another.
Ephesians 5:30
of which we are the several parts constituting his body.
Philippians 2:5
for the same temper of mind ought to be in you as was in Christ Jesus: