﴿ وَكَانُوا۟ يَقُولُونَ أَئِذَا مِتْنَا وَكُنَّا تُرَابًۭا وَعِظَٰمًا أَءِنَّا لَمَبْعُوثُونَ ﴾

“and would say, “What! After we have died and become mere dust and bones, shall we, forsooth, be raised from the dead? -”

Please check ayah 56:56 for complete tafsir.