But since prophet Muhammad only spoke Arabic, he could be the final prophet for the Arabs. How can he be a prophet/last prophet for the non Arabs? Quran clearly said your prophet speaks your language. In that case Guru Nanak, Bahaullah etc are still valid for their respective community right? Not only that, following verses shows that prophet Muhammad was sent for the Arabs in Mecca.
And this is a Book We have sent down, blessed (and) sincerely (verifying) that which was before (Literally: between its two hands) it, and for you to warn the Mother of the Towns (Makkah) and whomever are around it; and the ones who believe in the Hereafter believe in it, and they (constantly) preserve their prayer. (Quran 6 92)
The learned scholars of Bani Isra-eel knew that The Prophet that was eagerly awaited to free them from bondage to the curses of the law would come to Arabia and the covenant to support him was made at Sinai - this is how Salmaan Al Faarisi arrived in Arabia from Persia via Ash-Shaam.
The letters of Paul also allude to it (although it has been polluted with statements of false pride - search " kjv two covenants agar sinai arabia " (agar is hajar the mother of Isma'eel - the father of the Arabs) and refer to Allah's reminder to them in surah Al Baqarah Ch.2 and also to their covenant in Deuteronomy to assist the idol smashing Prophet)
192. Verily this is a Revelation from the Lord of the Worlds:
193. With it came down the spirit of Faith and Truth-
194. To thy heart and mind, that thou mayest admonish.
195. In the perspicuous Arabic tongue.
196. Without doubt it is (announced) in the Books of former peoples.
197. Is it not a Sign to them that the Learned of the Children of Israel knew it (as true)?
198. Had We revealed it to any of the non-Arabs,
199. And had he recited it to them, they would not have believed in it.
200. Thus have We caused it to enter the hearts of the sinners.
201. They will not believe in it until they see the grievous Penalty;
202. But the (Penalty) will come to them of a sudden, while they perceive it not;
203. Then they will say: “Shall we be respited?”
204. Do they then ask for Our Penalty to be hastened on?
205. Seest thou? If We do let them enjoy (this life) for a few years,
206. Yet there comes to them at length the (Punishment) which they were promised!
207. It will profit them not that they enjoyed (this life)!
208. Never did We destroy a population, but had its warners –
209. By way of reminder; and We never are unjust.
210. No evil ones have brought down this (Revelation):
211. It would neither suit them nor would they be able (to produce it).
212. Indeed they have been removed far from even (a chance of) hearing it.
213. So call not on any other god with Allah, or thou wilt be among those under the Penalty.
214. And admonish thy nearest kinsmen,
215. And lower thy wing to the Believers who follow thee.
216. Then if they disobey thee, say: “I am free (of responsibility) for what ye do!”
217. And put thy trust on the Exalted in Might, the Merciful,-
218. Who seeth thee standing forth (in prayer),
219. And thy movements among those who prostrate themselves,
220. For it is He Who heareth and knoweth all things.
221. Shall I inform you, (O people!), on whom it is that the evil ones descend?
222. They descend on every lying, wicked person,
223. (Into whose ears) they pour hearsay vanities, and most of them are liars.
224. And the Poets,- It is those straying in Evil, who follow them:
225. Seest thou not that they wander distracted in every valley?-
226. And that they say what they practise not?-
227. Except those who believe, work righteousness, engage much in the remembrance of Allah, and defend themselves after they are unjustly attacked. And soon will the unjust assailants know what vicissitudes their affairs will take!
From Quran Chapter 26
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The Messenger would be Arab - and i can think of no logical reason to send the message in a different tongue - especially since Arabic is such an eloquent yet condensed language.
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43. Nothing is said to thee that was not said to the apostles before thee: that thy lord has at his Command (all) forgiveness as well as a most Grievous Penalty.
44. Had We sent this as a Qur’an (in the language) other than Arabic, they would have said: “Why are not its verses explained in detail? What! (a Book) not in Arabic and (a Messenger an Arab?” Say: “It is a Guide and a Healing to those who believe; and for those who believe not, there is a deafness in their ears, and it is blindness in their (eyes): They are (as it were) being called from a place far distant!”
From Quran Chapter 41
154. When the anger of Moses was appeased, he took up the tablets: in the writing thereon was guidance and Mercy for such as fear their Lord.
155. And Moses chose seventy of his people for Our place of meeting: when they were seized with violent quaking, he prayed: “O my Lord! if it had been Thy will Thou couldst have destroyed, long before, both them and me: wouldst Thou destroy us for the deeds of the foolish ones among us? this is no more than Thy trial: by it Thou causest whom Thou wilt to stray, and Thou leadest whom Thou wilt into the right path. Thou art our Protector: so forgive us and give us Thy mercy; for Thou art the best of those who forgive.
156. “And ordain for us that which is good, in this life and in the Hereafter: for we have turned unto Thee.” He said: “With My punishment I visit whom I will; but My mercy extendeth to all things. That (mercy) I shall ordain for those who do right, and practise regular charity, and those who believe in Our signs;-
157. “Those who follow the Messenger - The Unlettered Prophet, whom they find mentioned in their own (scriptures),- in the law and the Gospel;- for he commands them what is just and forbids them what is evil; he allows them as lawful what is good (and pure) and prohibits them from what is bad (and impure); He releases them from their heavy burdens and from the yokes that are upon them. So it is those who believe in him, honour him, help him, and follow the light which is sent down with him,- it is they who will prosper.”
158. day: “O humankind! I am sent unto you ALL as the Messenger of Allah, to Whom belongeth the dominion of the heavens and the earth: there is no god but He: it is He That giveth both life and death. So believe in Allah and His Messenger, the Unlettered Prophet, who believeth in Allah and His words: follow him that (so) ye may be guided.”
From Quran Chapter 7
Although Pauls open reference to the "promise" / covenant is found in his letter to the Galatians (he used to raid the houses of believers and confiscate material before he accepted and submitted - then encoded a bunch of gems into stuff that appears as nonsense to the careless) - i couldn't find it in the O.T - Although Allah mentions it in the Quran - indicating that it was removed from the O.T later than Paul (but i've already seen how slyly this is done via my readings of recent Bengali versions of the bible via comparison to English versions).
22For it is written, that Abraham had two sons, the one by a bondmaid, the other by a freewoman. 23But he who was of the bondwoman was born after the flesh; but he of the freewoman was by promise.
24Which things are an allegory: for these are the two covenants; the one from the mount Sinai, which gendereth to bondage, which is Agar. 25For this Agar is mount Sinai in Arabia, and answereth to Jerusalem which now is, and is in bondage with her children. 26But Jerusalem which is above is free, which is the mother of us all. 27For it is written, Rejoice, thou barren that bearest not; break forth and cry, thou that travailest not: for the desolate hath many more children than she which hath an husband. 28Now we, brethren, as Isaac was, are the children of promise.
From Galatians 4
The final reference he made to the young woman sent to the desolate wilderness is to be found in Isaiah 54. It also mentions that He - the God of Israel - is called "the God of All the earth" - even though the Law of Moses was to the chosen tribe, the Children of Israel - and so was Messiah 1.0 (primarily) - all announcing God's future mercy to the whole world.
Zechariah 14.9 confirms that it is a future Promise.
Also the questions to the Baptist in the opening chapter of the gospel according to John and also John 6:14 make it clear that That Prophet that should come into the world was yet awaited and that he was not the Messiah (John 7:40-41) - therefore AFTER Messiah 1.0
40. O Children of Israel! call to mind the (special) favour which I bestowed upon you, and fulfil your covenant with Me as I fulfil My Covenant with you, and fear none but Me.
41. And believe in what I reveal, confirming the revelation which is with you, and be not the first to reject Faith therein, nor sell My Signs for a small price; and fear Me, and Me alone.
42. And cover not Truth with falsehood, nor conceal the Truth when ye know (what it is).
43. And be steadfast in prayer; practise regular charity; and bow down your heads with those who bow down (in worship).
44. Do ye enjoin right conduct on the people, and forget (To practise it) yourselves, and yet ye study the Scripture? Will ye not understand?
45. Nay, seek ((Allah)’s) help with patient perseverance and prayer: It is indeed hard, except to those who bring a lowly spirit,-
46. Who bear in mind the certainty that they are to meet their Lord, and that they are to return to Him.
47. O Children of Israel! call to mind the (special) favour which I bestowed upon you, and that I preferred you to all other (for My Message).
48. Then guard yourselves against a day when one soul shall not avail another nor shall intercession be accepted for her, nor shall compensation be taken from her, nor shall anyone be helped.
From Quran Chapter 2 Al Baqarah