The Holy Quran 4:159 — Surah An-Nisa

Arabic text

وَإِن مِّنْ أَهْلِ ٱلْكِتَـٰبِ إِلَّا لَيُؤْمِنَنَّ بِهِۦ قَبْلَ مَوْتِهِۦ ۖ وَيَوْمَ ٱلْقِيَـٰمَةِ يَكُونُ عَلَيْهِمْ شَهِيدًا

Translation

Every person belonging to the Ahlul Kitaab (every Christian present when Isa عليه الصلاة والسلام will kill Dajjaal) shall certainly believe in him (Isa عليه الصلاة والسلام) before his (the person's) death, and on the Day of Judgement, he (Isa عليه الصلاة والسلام) shall be a witness against them (he will testify against the Jews who refused to acknowledge his Prophethood and against the Christians who regarded him as Allaah and Allaah's son).

Tafsir (excerpt) — Tafsir Usmani

Isa ﵇ is alive: Isa ﵇ is alive and present in the heavens. When the Dajjal (the False Messiah) appears, he will come to this world and kill him, and the Jews and the Christians will believe in him, [acknowledging] that Isa ﵇ is indeed alive and had not died.

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