﴿ وَإِن مِّنْ أَهْلِ ٱلْكِتَٰبِ إِلَّا لَيُؤْمِنَنَّ بِهِۦ قَبْلَ مَوْتِهِۦ ۖ وَيَوْمَ ٱلْقِيَٰمَةِ يَكُونُ عَلَيْهِمْ شَهِيدًۭا ﴾

“Yet there is not one of the followers of earlier revelation who does not, at the moment of his death, grasp the truth about Jesus; and on the Day of Resurrection he [himself] shall bear witness to the truth against them.”

And there is not one of the People of the Scripture but will assuredly believe in him in Jesus before his death that is before the death of one belonging to the People of the Scripture upon seeing the angels of death with his very eyes at which point his faith will not profit him; or it means before the death of Jesus after he descends at the approach of the Hour as is stated in hadīth; and on the Day of Resurrection he Jesus will be a witness against them of what they did when he was sent to them.