"Does man think"—referring to the polytheist—"that We will not assemble his bones?" meaning: that We will not resurrect him.
﴿أيحسب الْإِنْسَان﴾ وَهُوَ الْمُشْرِكُ ﴿أَنْ لَنْ نَجْمَعَ عِظَامه﴾ أَي: أَن لن نبعثه