Islamic Scholars say that Chapter 111 is one of the miracles of the Quran
Islamic Scholars say that if Abu Lahab (and his wife) would have embraced Islam the whole Quran would have been in question. Because Quran clearly dictated that Abu Lahab (and his wife) will dwell in the Eternal Fire in the Hereafter, and both Abu Lahab (and his wife) did not embraced Islam and died as being unbelievers.
It should be emphasized that Abu Lahab (and his wife) had the chance to do that for Ten years (= 365 X 10 days). This means that Abu Lahab had 3,650 chances if he, one day, would have said that he is a Muslim and he believes in Allah, Muhammad and the Quran. In this case, the Divine nature of the Quran would have been suspicious and the trustfulness of the entire Quran would have been questionable. Also, Abu Lahab's wife had the same 3,650 chances to prove that the Quran is not revealed by Allah.
Chapter 111 was revealed at a time when no one but Allah could say who will or will not become believers later on. Many of the most severe opponents in the early days of Islam became devoted followers in later days, but not this couple (Abu Lahab and his wife). They tried everything to oppose, ridicule, and disprove the Quran. One would expect that they would also pretend to become believers just to throw doubt on the accuracy of the Quran. But they did not apply this obvious strategy. The logic question is what prevented them; if not the knowledge of Allah who knows that they will never believe or even try to claim that?
Not only that but there were at least 1,200 opponents of Islam around Abu Lahab and none of them had proposed to or encouraged Abu Lahab and/or his wife to claim that they are believers.
This increase the chance to 10 years X 365 days X 1200 opponents = 4, 38 Million chances to prove that the Quran is not revealed by Allah and Muhammad is a liar. However, this never happened.
For this reason, this Surah contains a clear miracle from Allah. Allah revealed this Surah before Abu Lahab’s death and his wife’s death. He informed them that they would roast in the Fire, which necessarily means that they would never accept Islam. This is what happened, exactly as the Knower of the unseen, Allah, informed us!