Did God use a mediator between two parties in making His covenant?

Les explains that the covenant promise made to Abraham was spiritual, never leaving the hands of spiritual beings, and was heavenly in origin. Abraham was merely the subject; he could not touch or change it, and even though his offspring broke it repeatedly, God kept it settled and will never go back on it. Using the analogy of a labor dispute, a mediator is normally brought in to reconcile two parties and produce a contract, but God is not going to use a three-person mediation. Instead, God is the mediator, the instigator, and the fulfiller, and He alone is involved. This confirms God is not through with Israel and will finish and fulfill those covenant promises.