Surah 2 : Ayah 55

وَإِذْ قُلْتُمْ يَـٰمُوسَىٰ لَن نُّؤْمِنَ لَكَ حَتَّىٰ نَرَى ٱللَّهَ جَهْرَةً فَأَخَذَتْكُمُ ٱلصَّـٰعِقَةُ وَأَنتُمْ تَنظُرُونَ

And [remember] when you said, “O Moses, we will never believe you until we see Allah openly,” so a thunderbolt struck you while you were looking on.