The Ishmalites, the Saracens, the Hagerins and the Majurums when they claim that Deuteronomy 18:18 prophesies about their prophet, then we has Christians should go ahead to investigate the truth.
1st we need to look into the covenant or blessings given by Yahweh God to his prophets or the blessings given by father to the son.
Adam and Eve bear two sons Caine and Abel (Gen 4:1-16). Caine then murders Abel and fled.
Adam and Eve then bear Seth (Gen 5:3).
Note: Abel is dead and Caine is cursed so, Seth the third son is blessed and from him the generation grows, till Noah. (Gen 5: 1-32).
Noah then bears 3 sons Shem, Ham and Japheth at the age of 500. (Gen 5:32). After the global flood, Noah finds a land Ararat, the place where the ark stops (Gen 8:5) where he becomes the tiller of soil and the first to plant the vine. He drank the vine and uncovered himself. Now Ham, Canaan’s ancestor saw his father nakedness and told his two brothers (Gen 9:18-24). So, Shem and Japheth took a cloak and put it on their father.
So, Noah blesses his two sons,
‘Accursed be Canaan
He shall be his brothers’
Meanest slave. (Gen 9:25)
‘Blessed be Yahweh, God of Shem,
Let Canaan be his slave!
May God extend Japheth, may he live in the tents of Shem,
And may Canaan be his slave!’ (Gen 9:26)
And now from the descendant from Shem, Abraham is born.
Note: Shem is blessed from his father Noah. (Gen 11:10-27)
From Abraham Ishmael is born (Gen 16) and Isaac (Gen 21:1-7).
Note: God Almighty blesses Ishmael and says he will be father of 12 princes and will make, him a great nation. (Gen 17:21) But Yahweh God’s covenant will be on Isaac (Gen 17:22). From here the division begins between Ishmaelite and Nasara or Nasarins. The story of Ishmael ends in (Gen 21:8-21). But the story of Isaac continues and he marries Rebekah. (Gen 24:67).
Ishmael then makes a short appearance and along with his brother Isaac buries his father Abraham. (Gen 25: 12-15).
The promise by Yahweh God comes true and Ishmael bears 12 sons (Gen 25:12-15). Ishmael dies at the age 137 years (Gen 25: 17-18)
The story proceeds from Isaac, Rebekah bears two sons Esau and Jacob. When Rebekah was pregnant, the children struggled with one another in her womb. She goes to Yahweh and God almighty says these are two great nations. (Gen 25: 19-28). It was prophesied that the elder will serve the younger.
Jacob is blessed by his father Isaac (Gen 27). The prophesy comes true where the younger son Jacob will reign over his elder brother Esau. So, the blessed one Jacob marries and bears 12 sons. (Gen 35: 23-26).
Now, it is from this 12 sons, 12 tribes are formed and from the levi tribe, Moses and Aaron are born who are the sons of Amram and Jochebed (Exo 6:20)
Note: Moses was not a good speaker so he needs mouthpiece, so he prays to Yahweh God to send anyone for his aid, on hearing this Yahweh God becomes angry. The reason is God almighty wants the mouthpiece to be from the tribe of Jacob, so Aaron was chosen who was from the Levite tribe. (Exo 4:13-17).
Note: The theme of younger is preferred over the elder by Yahweh. This preference demonstrates the freedom of God’s choice.
Adam begets Caine, Abel and Seth.
Noah begets Shem Ham and Japheth (Gen 7:13-14)
Isaac is preferred over Ishmael, Jacob over Esau and Rachel over to Leah.
Note: Moses put all the commands of Yahweh into writing, and early next morning he built an altar at the foot of the mountain (Sinai), with 12 standing stones for 12 tribes of Israel. (Ex 24:4-5), (Jos 4:3-9), (1 Kings 18:31), (Ex 28: 6-14). These 12 stones were to honor 12 tribes of Israel and not 12 sons of Ishmael (Ex 28: 21-22).
One question….if a prophet like Moses was promised then he should be from the lineage of Moses and not Ishmael. But Esau can be considered also since he married Mahalath the daughter of Ishmael (Gen 28:9).
So, if we conclude then the prophet promised to Moses will be from the tribe of Jacob, and among thy brethren means among the 12 tribes of Israel. So, (Deut 18:18) is solved that the prophet promised will be from the tribe of Jacob (Israel) and not from any foreign tribe such as (Ishmael).
Still not convincing then the answer for (Deut 18:18) is in (Acts 3: 22-25)
Peter says: The Lord God will raise a prophet among you, who will resemble me! Listen carefully to everything he tells you. (Acts 3:22-25).
Moses then goes on to say that he will appoint a king which Yahweh God will choose, who must be one from among your brothers (12 tribes of Israel). And not to appoint a foreign king who is not your brothers, for example Ishmaelite (Gen 17:14-15).
21 So you shall divide this land among you according to the tribes of Israel. 22 You shall allot it as an inheritance for yourselves and for the aliens who reside among you and have begotten children among you. They shall be to you as citizens of Israel; with you they shall be allotted an inheritance among the tribes of Israel. 23 In whatever tribe aliens reside, there you shall assign them their inheritance, says the Lord GOD.
Stephen’s Speech: It was Moses who told the ‘’Sons of Israel’’ God will raise a prophet like myself for you from among your own brothers. (Acts 7:37)
Note: Stephen knew whom did Moses address his speech, the messengers and the prophets knew clearly that Moses spoke to the Sons of Israel. So, why doubt???
And if we ignore all the factors then one serious question arises why Yahweh God always addresses himself has God of Abrahm, God of Isaac and God of Jacob but not God of Ishmael???(Gen 28:13)