Galatians 3:20

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

1 Timothy 2:5

For there is one God, and one Mediator between God and men, the man Christ Jesus:

Hebrews 8:6

But now He hath obtained a more excellent ministry, inasmuch as He is also the mediator of a better covenant, which is established upon better promises.

Hebrews 9:15

And on this account He is the mediator of a new covenant, that undergoing death for the redemption of transgressions against the first covenant, they that are called might receive the promise of an eternal inheritance.

Hebrews 12:24

and to Jesus the mediator of the new covenant, and to the blood of sprinkling, that speaketh better things than Abel.

Acts 12:20

And Herod was going to make war upon the Tyrians and Sidonians: but they came to him with one consent, and making interest with Blastus the king's chamberlain, they sued for peace; because their territory was supplied with provision by the king's country.

Romans 3:29-30

or is He the God of the Jews only, and not also of the Gentiles?

Galatians 3:17

This then I say, that the law, which was given four hundred and thirty years after, cannot disannul the covenant, which was so long before confirmed by God unto Christ, to make void 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
And Herod was going to make war upon the Tyrians and Sidonians: but they came to him with one consent, and making interest with Blastus the king's chamberlain, they sued for peace; because their territory was supplied with provision by the king's country.
1 Timothy 2:5
For there is one God, and one Mediator between God and men, the man Christ Jesus:

But

Galatians 3:17
This then I say, that the law, which was given four hundred and thirty years after, cannot disannul the covenant, which was so long before confirmed by God unto Christ, to make void the promise.
Romans 3:29
or is He the God of the Jews only, and not also of the Gentiles?

General references

Romans 3:30
surely of the Gentiles also: seeing it is one God who will justify the circumcision by faith, and uncircumcision also through faith.
James 2:19
Thou believest that there is one God; thou dost well: the devils also believe and tremble.