﴿ لِّنَفْتِنَهُمْ فِيهِ ۚ وَمَن يُعْرِضْ عَن ذِكْرِ رَبِّهِۦ يَسْلُكْهُ عَذَابًۭا صَعَدًۭا ﴾

“so as to test them by this means: for he who shall turn away from the remembrance of his Sustainer, him will He cause to undergo suffering most grievous.”

(That We may test them thereby) in order that they may revert to that which I have ordained for them, (and whoso turneth away from the remembrance of his Lord) and whoever turns away from believing in the divine Oneness and Scripture of his Lord, i.e. the Qur'an-this refers to al-Walid Ibn al-Mughirah al-Makhzumi; (He will thrust him into ever growing torment) climbing a mountain of smooth stones; and it is said this means: climbing a mountain of copper in the Fire.