To listen to a prophet who speaks in God’s Name.
1) Any prophet who arises and says that God sent him does not have to perform a sign of the type that Moses, Elijah or Elishah did, which involved supernatural events. Instead, the sign that he has to perform is to predict the future, and we have to believe him, as it is written, “And if you say in your heart, ‘How shall we know the word which the Lord has not to spoken?'” Therefore, when a man suitable for prophecy comes in the Name of God, without wanting to add to or take away from, any of the commandments, but wants us to serve God properly, we do not ask him to split the sea, or to resurrect the dead, or to perform some other supernatural event, and then believe him, but we tell him to predict the future because he is a prophet, which he does, and we wait to see if what he says happens or not. Even if was wrong in only a small matter, he is a false prophet, but if all of what he said comes true, then he is believed.
2) A prophet has to be checked many times. If all his words are true then he is a prophet, as it says with respect to Samuel, “And all Israel, from Dan to Be’erSheva, knew that Samuel was accredited as a prophet of the Lord.”
5) If a prophet says about another prophet that he is [indeed] a prophet, then he is assumed to be a prophet, and the prophet who said it does not have to be cross-examined. Moses vouched for Joshua, and all of Israel believed in him before he performed a sign. Similarly in the following generations: it is forbidden to doubt or debate the prophecy of a prophet who has been found to be right time and time again, or the prophecy of a prophet who has been vouched for by another prophet, and it is [also] forbidden to test him excessively or for ever [for one who tests him is like one who tests God], for it is written, “Do not test the Lord your God as you tested Him in Massah,” when we said, “Is the Lord among us, or not?” Once it has become known that he is a prophet, they will believe and know that God is amongst them, and they will nor debate or doubt his words, in accordance with what is written, “…yet they shall know that there has been a prophet amongst them.”
From: The Laws of The Basic Principles Of The Torah http://www.jewishvirtuallibrary.org/jsource/Judaism/Principles_of_Judaism.html
30Aaron repeated all the words that the Lord had spoken to Moses, and he performed the signs in the sight of the people, 31and the people were convinced. When they heard that the Lord had taken note of the Israelites and that He had seen their plight, they bowed low in homage. Exodus 4/30-31 Tanakh JPS 1985.
Commentary:
“we tell him to predict the future because he is a prophet, which he does, and we wait to see if what he says happens or not. Even if was wrong in only a small matter, he is a false prophet, but if all of what he said comes true, then he is believed.”
“If a prophet says about another prophet that he is [indeed] a prophet, then he is assumed to be a prophet, and the prophet who said it does not have to be cross-examined.”
The righteous servant of G-d of Isaiah 53 is a prophet who serves G-d with devotion to His purpose. He is the fulfillment of this prophecy of Isaiah by his description. He is not a prophet who predicts the future like a seer. He is a servant and that servant is me, Keith Ellis McCarty.
Moses vouched for Joshua, and all of Israel believed in him before he performed a sign. Isaiah vouches for me. And the sign of G-d to confirm it are these writings.
Properly explaining Isaiah 53 and fitting the description of every verse is the sign that G-d had Isaiah write for the Jewish people to know that I am a prophet of G-d. And G-d has added to that by showing me how to explain that the righteous servant of G-d of Isaiah 53 is Elijah by joining the prophecy of Malachi with Isaiah 53; by explaining what it means to be Elijah; by showing how the stories of Elijah can be used to identify Elijah; by explaining what wrestling with a man and divine beings is; by explaining what a host of the Lord of hosts is; that Elijah the Tishbite from Gilead east of the river Jordan and the captain of the Lord’s hosts are gentiles; that G-d coming from Edom in Isaiah 63 means He comes from the Christian world with His gentile anointed king who is the gentile Elijah and a gentile host of the Lord of hosts; and that the spirit of the Holy G-d is a person G-d created.
The things to happen in the future were foretold by Isaiah. Their fulfillment is my prophecy.
It is forbidden to doubt or debate the prophecy of a prophet who has been vouched for by another prophet and it is forbidden to test him excessively [for one who tests him is like one who tests God], for it is written, “Do not test the Lord your God as you tested Him in Massah,”
All of the words of the commentaries of these writings are true. HaShem and the person of the spirit of the Holy G-d dwell with me and HaShem is in charge of everything I write, say and do. That includes this writing.
My name is Keith Ellis McCarty and I am the prophet of G-d described in Isaiah 53. All of the signs and words of G-d are in these writings.
Keith Ellis McCarty, Esquire 
Keith McCarty said:
Reblogged this on Keith Ellis McCarty, Esquire and commented:
The righteous servant of G-d of Isaiah 53 is a prophet who serves G-d with devotion to His purpose. He is the fulfillment of this prophecy of Isaiah by his description. He is not a prophet who predicts the future like a seer. He is a servant and that servant is me, Keith Ellis McCarty.
Moses vouched for Joshua, and all of Israel believed in him before he performed a sign. Isaiah vouches for me. And the sign of G-d to confirm it are these writings.
Properly explaining Isaiah 53 and fitting the description of every verse is the sign that G-d had Isaiah write for the Jewish people to know that I am a prophet of G-d. And G-d has added to that by showing me how to explain that the righteous servant of G-d of Isaiah 53 is Elijah by joining the prophecy of Malachi with Isaiah 53; by explaining what it means to be Elijah; by showing how the stories of Elijah can be used to identify Elijah; by explaining what wrestling with a man and divine beings is; by explaining what a host of the Lord of hosts is; that Elijah the Tishbite from Gilead east of the river Jordan and the captain of the Lord’s hosts are gentiles; that G-d coming from Edom in Isaiah 63 means He comes from the Christian world with His gentile anointed king who is the gentile Elijah and a gentile host of the Lord of hosts; and that the spirit of the Holy G-d is a person G-d created.
The things to happen in the future were foretold by Isaiah. Their fulfillment is my prophecy.
It is forbidden to doubt or debate the prophecy of a prophet who has been vouched for by another prophet and it is forbidden to test him excessively [for one who tests him is like one who tests God], for it is written, “Do not test the Lord your God as you tested Him in Massah,”
All of the words of the commentaries of these writings are true. HaShem and the person of the spirit of the Holy G-d dwell with me and HaShem is in charge of everything I write, say and do. That includes this writing.