Galatians 3:20

Now the mediator is not a mediator of one; but God is one.

1 Timothy 2:5

For there is one God, one mediator also between God and men,

Hebrews 8:6

And now he hath obtained a more excellent ministry, by how much better a covenant he is a mediator of, which is established upon better promises.

Hebrews 9:15

And for this end he is the Mediator of a new covenant, that by means of death for the redemption of the transgressions that were under the first covenant, they who are called might receive the promise of the eternal inheritance.

Hebrews 12:24

And to Jesus the mediator of the new covenant, and to the blood of sprinkling, which speaketh better things than that of Abel. See that ye refuse not him that speaketh:

Acts 12:20

And he was highly incensed against them of Tyre and Sidon: but they came with one accord to him, and having gained Blastus, the king's chamberlain, sued for peace; because their country was nourished by the king's country.

Romans 3:29-30

Is God the God of the Jews only, and not also of the Gentiles? Surely of the Gentiles also: Seeing it is one God who will justify the circumcision by faith,

Galatians 3:17

And this I say, the covenant which was before confirmed of God through Christ, the law which was four hundred and thirty years after, doth not disannul, so as to make the promise of no effect.

Treasury of Scripture Knowledge

Summary

Now a mediator is not a mediator of one, but God is one.

A mediator is

General references

Bible References

A mediator is

Acts 12:20
And he was highly incensed against them of Tyre and Sidon: but they came with one accord to him, and having gained Blastus, the king's chamberlain, sued for peace; because their country was nourished by the king's country.
1 Timothy 2:5
For there is one God, one mediator also between God and men,

But

Galatians 3:17
And this I say, the covenant which was before confirmed of God through Christ, the law which was four hundred and thirty years after, doth not disannul, so as to make the promise of no effect.
Romans 3:29
Is God the God of the Jews only, and not also of the Gentiles? Surely of the Gentiles also: Seeing it is one God who will justify the circumcision by faith,

General references

Romans 3:30
and the uncircumcision through the same faith.
James 2:19
Thou believest there is one God: thou dost well: the devils also believe and tremble.