Galatians 3:20

Now a mediator is not for one party only; whereas God is only one.

1 Timothy 2:5

For there is one God, and one mediator also between God and men, the man Christ Jesus,

Deuteronomy 6:4

Hear, O Israel! The Lord is our God, the Lord is one!

Hebrews 8:6

But now He has obtained a more excellent ministry, by as much as He is also the mediator of a better covenant, which has been enacted on better promises.

Hebrews 9:15

For this reason He is the mediator of a new covenant, so that, since a death has taken place for the redemption of the transgressions that were committed under the first covenant, those who have been called may receive the promise of the eternal inheritance.

Hebrews 12:24

and to Jesus, the mediator of a new covenant, and to the sprinkled blood, which speaks better than the blood of Abel.

Genesis 15:18

On that day the Lord made a covenant with Abram, saying,
To your descendants I have given this land,
From the river of Egypt as far as the great river, the river Euphrates:

Genesis 17:1-2

Now when Abram was ninety-nine years old, the Lord appeared to Abram and said to him,
“I am God Almighty;
Walk before Me, and be blameless.

Job 9:33

“There is no umpire between us,
Who may lay his hand upon us both.

Acts 12:20

Now he was very angry with the people of Tyre and Sidon; and with one accord they came to him, and having won over Blastus the king’s chamberlain, they were asking for peace, because their country was fed by the king’s country.

Romans 3:29-30

Or is God the God of Jews only? Is He not the God of Gentiles also? Yes, of Gentiles also,

Galatians 3:17

What I am saying is this: the Law, which came four hundred and thirty years later, does not invalidate a covenant previously ratified by God, so as to nullify the promise.

Treasury of Scripture Knowledge

Summary

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

Bible References

A mediator is

Job 9:33
“There is no umpire between us,
Who may lay his hand upon us both.
Acts 12:20
Now he was very angry with the people of Tyre and Sidon; and with one accord they came to him, and having won over Blastus the king’s chamberlain, they were asking for peace, because their country was fed by the king’s country.
1 Timothy 2:5
For there is one God, and one mediator also between God and men, the man Christ Jesus,

But

Galatians 3:17
What I am saying is this: the Law, which came four hundred and thirty years later, does not invalidate a covenant previously ratified by God, so as to nullify the promise.
Genesis 15:18
On that day the Lord made a covenant with Abram, saying,
To your descendants I have given this land,
From the river of Egypt as far as the great river, the river Euphrates:
Genesis 17:1
Now when Abram was ninety-nine years old, the Lord appeared to Abram and said to him,
“I am God Almighty;
Walk before Me, and be blameless.
Deuteronomy 6:4
Hear, O Israel! The Lord is our God, the Lord is one!
Romans 3:29
Or is God the God of Jews only? Is He not the God of Gentiles also? Yes, of Gentiles also,

General references

Deuteronomy 5:3
The Lord did not make this covenant with our fathers, but with us, with all those of us alive here today.
Romans 3:30
since indeed God who will justify the circumcised by faith and the uncircumcised through faith is one.
James 2:19
You believe that God is one. You do well; the demons also believe, and shudder.