Then why not say, a prophet from your descendants, your offspring, your seed. Why use the word Brethren, which includes their relations from Abraham pbuh who had several wives.
As already shown that Prophet was to have God's words put into his mouth. When the people asked John the Baptist about Jesus pbuh he said, he was not Elijah, the Messiah or that Prophet Deut 18:18.
The late Reverend James L. Dow (1908-1977) who authored the Collins Gem Dictionary of the Bible wrote under the entry of 'Moses':
"The only man in history who can be compared even remotely to him is Mohammed."
Well I've already shown Saul came from the Desert and was found in a locked room. He came in the name of Christ and mislead many. The family and Disciples of Jesus pbuh considered him to be a liar, a great deceiver. He is likely the false Prophet mentioned in Rev 2:2. Due to his hijacking of Christianity and later developments, Trinity, the Jews are forbidden to enter a Church, but allowed to not only enter, but also pray in a Mosque. Many Prophets came from the Desert, Moses and Aaron pbut to name but two.
Here's what Jesus pbuh said according to you:
Isaiah 21:7
Knox Bible (KNOX)
7 A chariot he saw, with two out-riders (chariots), one that rode on an *** (singular), and one that rode on a camel (singular); looked long at them, watching them eagerly.
NOTE: A Chariot master is a Servant of GOD who is SENT BY GOD ALMIGHTY in the Bible: 1 Chronicles 28:18.
Christ fulfilled the riding of the *** or donkey vision, when he entered Jerusalem on an ***, in John 12:14.
Also, “looked long at them, watching them eagerly.” clearly means that these are two very important Servants.
8 And he cried, A lion: My lord, I stand continually upon the watchtower in the daytime, and I am set in my ward whole nights:
9 And, behold, here cometh a chariot of men, with a couple of horsemen. And he answered and said, Babylon is fallen, is fallen; and all the graven images of her gods he (Muhammad, Islam) hath broken unto the ground.
…….
13 The burden upon Arabia….
Babylon did indeed fall before Islam and the Islamic nation under the guidance of Muhammad (peace be upon him) did indeed succeed in eradicating the worship of idols from Babylon replacing it with the worship of God alone. In fact, the Muslims were the only believers in the God of Isaiah to ever succeed in fulfilling this prophesy.
As to "The burden upon Arabia ..." (Isaiah 21:13), what does it mean?
"…which also means an oracle is a word sometimes used in the prophetical writings to indicate a divine message of judgment" (Scofield Study Bible New King James Version, note 1, p. 792)
The pagan religions of Arabia had all originated from Babel. Pagan Arabia is called the Daughter of Babylon: Isaiah 47:1.
So “Babylon is fallen, is fallen” clearly refers to the fall of ALL OF THE IDOLS AND PAGAN RELIGIONS in all of the Arabic and Arabian lands.
In fact, Isaiah 47:1 and Jeremiah 51:33, give a mighty prophecy against the pagan religions of Arabia, and prophesied about its end, and replacement with a NEW DIVINE RELIGION.
Let’s read the two verses:
Isaiah 47:1
Come down, and sit in the dust, O virgin daughter of Babylon, sit on the ground: there is no throne, O daughter of the Chaldeans: for thou shalt no more be called tender and delicate.
Now why was Arabia called VIRGIN DAUGHTER OF BABYLON? Because the Arabs as I mentioned were fresh, and had no previous scriptures, nor religions. Arabia was a virgin in that. It had no previous religion, and it was ready for a Divine Religion to be sent to it, which is Islam! Allah Almighty Said in the Holy Quran:
[034:043] When Our Clear Signs are rehearsed to them, they say, "This is only a man who wishes to hinder you from the (worship) which your fathers practised." And they say, "This is only a falsehood invented!" and the Unbelievers say of the Truth when it comes to them, "This is nothing but evident magic!"
[034:044] But We had not given them Books which they could study, nor sent apostles to them before thee as Warners.
Furthermore, we read in Jeremiah 51:33:
Jeremiah 51:33
For thus saith the Lord of hosts, the God of Israel; The daughter of Babylon is like a threshingfloor, it is time to thresh her: yet a little while, and the time of her harvest shall come.
Arabia’s harvest is indeed the Divine Religion, Islam. GOD Almighty’s Original Faith on Earth, and the Religion of the people of KEDAR is Islam. Muhammad pbuh was the Servant of GOD Almighty to come, that was mentioned in Isaiah 41 & 42.