The Severity of Turning Away from Allah's Remembrance

لِّنَفْتِنَهُمْ فِيهِ ۚ وَمَن يُعْرِضْ عَن ذِكْرِ رَبِّهِۦ يَسْلُكْهُ عَذَابًا صَعَدًا

So We might test them therein. And whoever turns away from the remembrance of his Lord He will put into arduous punishment.