'Go-between' in the Bible
then shall an oath of the LORD go between them, whether he have put his hand unto his neighbor's good, and the owner of it shall take the oath, and the other shall not make it good.
And thy handmaid had two sons which fought together in the fields where was no man to go between them, and the one slew the other.
Sending forth fountains into the valleys, they will go between the mountains.
This is he who in the assembly in the wilderness (desert) was the go-between for the Angel who spoke to him on Mount Sinai and our forefathers, and he received living oracles (words that still live) to be handed down to us.
What then was the purpose of the Law? It was added [later on, after the promise, to disclose and expose to men their guilt] because of transgressions and [to make men more conscious of the sinfulness] of sin; and it was intended to be in effect until the Seed (the Descendant, the Heir) should come, to and concerning Whom the promise had been made. And it [the Law] was arranged and ordained and appointed through the instrumentality of angels [and was given] by the hand (in the person) of a go-between [Moses, an intermediary person between God and man].
Now a go-between (intermediary) has to do with and implies more than one party [there can be no mediator with just one person]. Yet God is [only] one Person [and He was the sole party in giving that promise to Abraham. But the Law was a contract between two, God and Israel; its validity was dependent on both].
And to Jesus, the Mediator (Go-between, Agent) of a new covenant, and to the sprinkled blood which speaks [of mercy], a better and nobler and more gracious message than the blood of Abel [which cried out for vengeance].