In answering my own question it is based on the Jewish." principle of a "Shaliah."
The Encyclopedia of the Jewish Religion, R.J.Z. Werblowsky, G. Wigoder, 1986, p. 15.
“Agent (Heb. Shaliah): The main point of the Jewish law of agency is expressed in the dictum, “a person’s agent is regarded as the person himself” (Ned. 72B; Kidd, 41b). Therefore any act committed by a duly appointed agent is regarded as having been committed by the principal, who therefore bears full responsibility for it with consequent complete absence of liability on the part of the agent.”
Most of the answers to the question I am asking appeals to this Jewish "dictum" where the angel of the Lord is speaking on behalf of God and they are "really" God's words.
The whole article can be found here: http://thehumanjesus.org/2017/04/09/shaliah-the-law-of-agency/ For the most part I agree with the article but not all of it in which I will explain why.
The following is from another site and I will quote what it says. "(Yeshua, as the agent of YHWH, if FULLY empowered to LEGALLY and FULLY represent YHWH. As the agent (shaliach) of God, Yeshua is "like," or the "likeness" and "image" of God; however, just as the agent (the one sent) is not the pricipal (who sent him), Yeshua is NOT God!)
The following is another illustration to justify that the angel of the Lord is not God. "If I finance the whole building project (so that I am the source of the construction - like the Father) and then use a general contractor (like the 'through' of the Son) I cannot claim that I ALONE built the building."
What makes most of the above invalid is the fact that a "Shaliah" has limitations. According to the "Jewish Virtual Library" a "Shaliah" is disqualified from acting as a witness in a case to carry out a specific mandate. The agent is not regarded as the pricipal, in the full snese of the term "as himself," since the agent is competent to testify with regard to the subject matter of his mandate in circumstances where the principal is disqualified from being a witness."
For example, if you witnessed a crime being committed and you have to appear in court to testify and be "sworn in" you can't send someone else to testify for you. Even if you could not make it to court, (maybe your in the hospital) the court will send someone to have you "deposed."
The bottom line in all of this is the fact that you cannot swear an oath on behalf of another. Plus the fact that swearing an oath is a personal commitment of "CONSCIENCE."
According to all the text of Scripture God is "NOT" disqualified from being a witness. Moreover, God is not disqualified for the sake of His conscience. As the text clearly indicated, At Genesis 22:15-16, The angel of the Lord called to Abraham a second time from heaven, vs16, AND SAID, "By Myself I have sworn declares the Lord,"
Hebrews 6:13, backs this claim up! "For when GOD made the promise to Abraham, since He could swear by no one greater, HE SWORE BY HIMSELF." Also Luke 1:73 and Acts 3:25. Conclusion: the angel of the Lord is God.