[Diamond]

My understanding is that it’s how the translators of the King James version chose to represent “Jehovah.”

That is correct.

I do not know the origins of the term “the God” in the verse in question.

Let me help you out with a graphic I made of the verse with an online interlinear Bible. You don't need to be a prophet to understand it:

See? Literally, "Jehovah he is Elohim."

Cordially,

[tantiboh]

Thanks. I will study the matter further.