Praise be to Allah, and peace and blessings be upon the Messenger of Allah. To proceed:
It has been established by authentic evidence that Jesus, son of Mary, peace be upon him, will descend at the end of time. He will kill the Antichrist (al-Masih al-Dajjal), break the cross, kill the swine, rule with justice, and accept nothing from the People of the Book except Islam. Allah تعالى says:
﴿And indeed, he is surely a sign of the Hour, so do not doubt it and follow Me. This is a straight path.﴾ [Az-Zukhruf: 61].
The correct opinion according to many exegetes is that the pronoun in the words of Allah تعالى, ﴿And indeed, he is surely a sign of the Hour﴾, refers to Jesus, peace be upon him. This means that his descent before the establishment of the Hour is a sign of its approaching. Numerous mass-transmitted hadiths have also been reported affirming his descent at the end of time.
Among the apparent wisdoms behind his descent, and Allah knows best, is that Islam will become manifest and its status will be elevated, and that Jesus, peace be upon him, will clarify the reality of his position after people differed concerning him. He will testify that the claims attributing divinity or sonship to him are false, and he will follow the law of Islam and rule with justice.
The Prophet ﷺ said:
“By Him in Whose Hand is my soul, the son of Mary is certainly about to descend among you as a just ruler. He will break the cross, kill the swine, abolish the jizyah, and wealth will become so abundant that no one will accept it.”
Narrated by Al-Bukhari and Muslim.
His descent will also establish the proof against the People of the Book and demonstrate the falsehood of beliefs that contradict Islam, until the religion becomes one, as the scholars have mentioned.
The scholars have also mentioned other wisdoms behind his descent, including: refuting the Jews who claimed that they killed him. His return will expose their claim as false, and Jesus will descend, becoming a cause of the destruction of those who deny him. It has also been said that one of the purposes of his descent is to call people to renew adherence to Islam at a time when the Dajjal appears; Jesus, peace be upon him, will kill the Dajjal and support the truth.
And Allah knows best.