43:61. And (jesus) shall be a Sign (for the coming of) the Hour (of Judgment): therefore have no doubt about the (Hour), but follow ye Me: this is a Straight Way.
In above ayah it is clear that Isa (AS) would be a sign of Qiyamah. Question arises, How?
That would happen as Isa (AS) is alive and would appear before Qiyamah.
**How it can be concluded that Isa (AS) has not passed away and would return before Qiyamah: Relevant ayahs (I am basing my argument) are 4:157-59:
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4:157. That they said (in boast), "We killed Christ Jesus the son of Mary, the Messenger of Allah.;- but they killed him not, nor crucified him, but so it was made to appear to them, and those who differ therein are full of doubts, with no (certain) knowledge, but only conjecture to follow, for of a surety they killed him not:-
4:158. Nay, Allah raised him up unto Himself; and Allah is Exalted in Power, Wise;-
4:159. And there is none of the People of the Book but must believe in him before his death; and on the Day of Judgment he will be a witness against them;-
IF one reads above ayahs together one can easily deduce that Isa (AS) is alive and that he would return to this material world near Qiyamah (judgement day). Here is how:
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4:157.**That they said (in boast), "We killed Christ Jesus the son of Mary, the Messenger of Allah.;- but they killed him not, nor crucified him, but so it was made to appear to them, and those who differ therein are full of doubts, with no (certain) knowledge, but only conjecture to follow, for of a surety they killed him not:-
In ayah 4:157 Allah tells that Isa (AS) was not crucified nor was killed rather it appeared to them (Jews, Romans and Christians) that they (Jews and Romans) killed him (AS). Time referred here is time Christians and Jews think Isa (AS) was crucified, or time of crucifixion.
As a person was crucified and dead body of that person was present, both Jews and Christians perceived that dead body was of Isa (AS). Allah in above ayah (4:157) tells that killed person and resulting dead body was not of Isa (AS), even though it appeared to them.
Since Isa (AS) disappeared after that event (of crucifixion) question arises what happened to Isa (AS)?
Allah answered above question in ayah 4:158 … and that is, Isa (AS) disappeared because ‘Allah raised him up unto Himself’.
[According to some Islamic commentary, the person who got crucified was not Isa (AS) but he was a person present at the occasion and Romans took him as Isa (AS) and crucified him. According to some Muslim claims, this person was one of Roman soldier. Some claim that he was ‘Judas’].
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4:158**. Nay, Allah raised him up unto Himself; and Allah is Exalted in Power, Wise;-
Ayah 4:158 is answer to ayah 4:157. According to Ayah 4:158 Allah raised ‘Isa (AS) unto himself’ [made Isa (AS) disappear from this material world]. This happened at the same time Christians and Jews believe Isa (AS) got crucified and killed.
So this ‘raising of Isa (AS) up unto himself’ is nothing to do with Isa (AS) dying (his soul leaving body), rather Allah at that particular time made Isa (AS) ‘physically disappear’ from this material world with ‘body and soul’.
[When we talk of death ‘inteqal’ in Islam, it means soul departing the body while in this material world (as death is part of this material world and not spiritual world). So, for Isa (AS) to die, he has to return to this material world from wherever he is, and then die. At that time Isa (AS) soul would leave Isa (AS) body in this material world].
Now … Even after accepting Isa (AS) physical disappearance at the time of crucifixion, someone might ask that how can anyone say with certainty that Isa (AS) did not returned sometime later from wherever Isa (AS) disappeared to, to spend his remaining life on this material world in silence (because no one heard of him after day of crucifixion so if he spent time in this world after date of crucifixion, then it must be in silence), and died natural death?
Well, Allah answered that in Ayah 4:159. ‘Ayah 4:159’ gives condition to get fulfilled before Isa (AS) would die. Until that condition is not fulfilled, Isa (AS) would not die. Here is Ayah:
4:159. And there isnone of the People of the Book but must believe in him before his death**; **and on the Day of Judgment he will be a witness against them;-
In Ayah 4:159, it is clearly mentioned that before Isa (AS) die, all people of the book must believe on Isa (AS).
Above Ayah (4:159) is most important ayahs in Quran regarding Isa (AS), Isa (AS) coming to this world before Qiyamah, and death of Isa (AS) just before Qiyamah.
In above ayah, Allah has given a condition that has to get fulfilled before Isa (AS) would die, and that condition is:** ‘All people of the book would believe on Isa (AS) before Isa (AS) die’.** That is to believe that Isa (AS) birth was miraculous (without Jawaz), he was Prophet (AS) of Allah, he was not crucified but taken away by Allah alive and that he is still alive.
It is obvious, as to believe on a prophet is to believe on the message of Allah through that Prophet. Allah’s message through Isa (AS) is that Isa (AS) birth was miraculous (was will of Allah without any cause or Jawaz) and that he is Prophet of Allah who was not crucified rather taken away by Allah alive.
To believe on mentioned messages is test for believers as such belief shows that Allah does not need Jawaz for making anything to happen. Rest of Isa (AS) messages were time dependent and thus became irrelevant with time.
Jews consider Isa (AS) was not Prophet but imposter. They give Jawaz to birth of Isa (AS) claiming that his birth was illegitimate not miraculous. They also believe that Isa (AS) was crucified and killed.
Christians consider Isa (AS) was not Prophet but ‘son of God’. They give Jawaz to birth of Isa (AS) claiming that ‘God was his literal father’. They also believe that Isa (AS) was crucified and killed.
Ridiculous beliefs of Jews and Christians are due to them unwilling to accept birth of Isa (AS) as miraculous (birth without Jawaz), and crucifixion that they perceived it was him.
It is only Muslims who believe that Isa (AS) was prophet, his birth was miraculous (without Jawaz), and that he was not crucified rather at time of crucifixion Isa (AS) was taken away by Allah alive (and that he is still alive).
**According to Ayah 4:159, above situation would change before Isa (AS) would die **(his soul would leave his material body).
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4:159.**And there is none of the People of the Book but must believe in him before his death; and on the Day of Judgment he will be a witness against them;-
Since the mentioned situation (all people of the book believing Isa (AS) as prophet, his birth as miraculous birth, and that he was not crucified but was taken away by Allah alive) has not happened yet means Isa (AS) is still alive.
As Isa (AS) death is to happen on this material world, Isa (AS) would return and would die once mentioned condition is fulfilled, that is, people of the book (Christians and Jews) present at that time would start believing that he is prophet, his birth was miraculous (birth without ‘jawaz’), and that he was not crucified. All would happen before Qiyamah in future.
Even though only Allah knows how it would happen, but this could happen if ‘all people of the book would become Muslim’ and they would change their own beliefs regarding Isa (AS) to Islamic belief …something is also predicted to happen before Qiyamah and after return of Isa (AS).
When that would happen only Allah knows, but certainly it has not happened as yet, but would surely going to happen in future before death of Isa (AS) and certainly before Qiyamah.
Note: If any Muslim thinks that Isa (AS) has died and disputes 2nd appearance before Qiyamah, they have to clarify that how condition mentioned in Quran (4:159) ‘none of the people of the book but must believe in Isa (AS) before Isa (AS) death’ can get fulfilled.