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One example of events foretold in the Quran is the victory of the Romans over the Persians within three to nine years after the Romans were defeated by the Persians. God has said in the Quran:
The Romans have been defeated in the nearest land (to the Arabian Peninsula), and they, after their defeat, will be victorious within bedd’ (three to nine) years.... (Quran, 30 : 2 - 4)
Let us see what history tells us about these wars. A book entitled History of the Byzantine State says that the Roman army was badly defeated at Antioch in 613, and as a result, the Persians swiftly pushed forward on all fronts [1].
At that time, it was hard to imagine that the Romans would defeat the Persians, but the Quran foretold that the Romans would be victorious within three to nine years. In 622, nine years after the Romans’ defeat, the two forces (Romans and Persians) met on Armenian soil, and the result was the decisive victory of the Romans over the Persians, for the first time after the Romans’ defeat in 613 [2].
The prophecy was fulfilled just as God has said in the Quran.
[1] History of the Byzantine State, Ostrogorsky, p. 95.
[2] History of the Byzantine State, Ostrogorsky, pp. 100-101, and History of Persia, Sykes, vol. 1, pp. 483-484. Also see The New Encyclopaedia Britannica, Micropaedia vol. 4, p. 1036.
 
  
     
     
     
     
    
    
Surely the One who has enjoined the Qur‘an upon you will surely bring you back to a place of return… (Quran 28:85)
This verse was revealed when the holy prophet (PBUH) left makkah for migration to madinah. He was promised by this verse that Allah would bring him back to makkah after some time, and he would enter it as a victor.
 
  
     
     
     
     
    
    
The Qur’an has also foretold the conquest of Mecca and the triumph of the Muslims over the polytheists as follows:
“That which God inspired in his prophet by means of a dream is true and veracious: Without any doubt you will enter the sacred mosque (in Mecca) in safety and security. You will shave your heads and shorten your hairs without any fear or anxiety. God knows what you do not know. And you will win a victory near at hand”. (48:27)
These predictions were made at a time when no military expert or adviser could have predicted the occurrence, given the difficult circumstances of the Muslims and the unfavorable situation in which they found themselves.
In the same verse (48:27), the Qur’an also mentions the future occurrence of another historical event, namely the triumph of the Muslim warriors at Khaybar, and their conquest of its formidable fortresses. Hard blows had been inflicted upon the Muslims from Khaybar, but in the end the army of Islam triumphed over the Jews, and the predictions of the Qur’an was completely fulfilled. Can we ascribe this precise knowledge of the future to the knowledge and speculation of the Prophet?
 
  
     
     
     
     
    
    
The Qur’an also predicts with clarity the final outcome of the life of a given individual, Abu Lahab, the obstinate enemy of Islam. It proclaims categorically that he will refuse the religion of monotheism until the very end of his life, and that for this reason his painful destiny will be to enter the fire of God’s wrath.
These are the verses of the Qur’an:
“May Abu Lahab perish, and may his two hands be cut off. The wealth he accumulated to destroy Islam has not availed him or saved him from destruction; he will soon fall into the flaming fire of Hell”. (111:1-3).
All historians agree that Abu Lahab closed his eyes on this world as an unbeliever, and that he persisted in his obstinate hostility to the prophet of Islam until the final moments of his life. The verses revealed concerning the events mentioned above constitute a further proof that the sacred book of Islam is from God.
There are also many other verses in the Quran and sayings of the Prophet Muhammad (PBUH) that mention future events which later came to pass.
 
  
     
     
     
     
    
    Narrated Thawban: The Prophet (ﷺ) said: The people will soon summon one another to attack you as people when eating invite others to share their dish. Someone asked: Will that be because of our small numbers at that time? He replied: No, you will be numerous at that time: but you will be scum and rubbish like that carried down by a torrent, and Allah will take fear of you from the breasts of your enemy and last enervation into your hearts. Someone asked: What is wahn (enervation). Messenger of Allah (ﷺ): He replied: Love of the world and dislike of death. [Sunan Abi Dawud 4297]
 
  
     
     
     
     
    
    How can one deny Islam after seeing all these prophecies? It is impossible for someone to know how these future events will take place 100% accurately without fault; it can't be possible unless he's a prophet of Allah SWT.