Quran 4:159 from Surah An-Nisaa on Divine Marvels.
وَإِن مِّنۡ أَهۡلِ ٱلۡكِتَٰبِ إِلَّا لَيُؤۡمِنَنَّ بِهِۦ قَبۡلَ مَوۡتِهِۦۖ وَيَوۡمَ ٱلۡقِيَٰمَةِ يَكُونُ عَلَيۡهِمۡ شَهِيدٗا
English translation: And (there is) not from (the) People (of) the Book but surely he believes in him before his death And (on the) Day (of) the Resurrection he will be against them a witness
Transliteration: wa-in min ahli al-kitabi illa layu'minanna bihi qabla mawtihi wayawma al-qiyamati yakunu alayhim shahidan