Galatians 3:20

Though an intermediary implies more than one party, yet God is only one.

1 Timothy 2:5

For there is but one God and one intermediary between God and men, the man Christ Jesus

Hebrews 8:6

But, as the case with Him now stands, He has entered upon a priestly service as much superior to theirs as the covenant of which He is the Mediator is superior to theirs, superior because it has been enacted upon superior promises.

Hebrews 9:15

And this is why He is the Mediator of a new covenant, in order that, after He had suffered death for securing redemption from the offenses committed under the first covenant, those who had been invited to share it might obtain the eternal inheritance promised them.

Hebrews 12:24

to Jesus the Mediator of the new covenant, and to the sprinkled blood which speaks a better message than even Abel's did.

Acts 12:20

Now Herod cherished a bitter grudge against the people of Tyre and Sidon. So in a united body they came to meet him, and after winning the favor of Blastus, the king's chamberlain, they asked for peace, because their country depended for its food supply upon the king's country.

Romans 3:29-30

Or is He the God of Jews alone? Is He not the God of heathen peoples too? Of course, He is the God of heathen peoples too,

Galatians 3:17

I mean this: The law which was given four hundred and thirty years later could not annul the contract which had already been ratified by God, so as to cancel the promise.

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
Now Herod cherished a bitter grudge against the people of Tyre and Sidon. So in a united body they came to meet him, and after winning the favor of Blastus, the king's chamberlain, they asked for peace, because their country depended for its food supply upon the king's country.
1 Timothy 2:5
For there is but one God and one intermediary between God and men, the man Christ Jesus

But

Galatians 3:17
I mean this: The law which was given four hundred and thirty years later could not annul the contract which had already been ratified by God, so as to cancel the promise.
Romans 3:29
Or is He the God of Jews alone? Is He not the God of heathen peoples too? Of course, He is the God of heathen peoples too,

General references

Romans 3:30
since there is but one God, who will consider the Jews in right standing with Himself, only on condition of their faith, and the heathen peoples on the same condition.
James 2:19
Do you believe in one God? Very well; the demons, too, believe that, and shudder.