Sura 2 Al-Baqarah (The Cow), ayah 55

1. وَإِذْ قُلْتُمْ يَا مُوسَىٰ لَنْ نُؤْمِنَ لَكَ حَتَّىٰ نَرَى اللَّهَ جَهْرَةً فَأَخَذَتْكُمُ الصَّاعِقَةُ وَأَنْتُمْ تَنْظُرُونَ

   And (recall) when you said, "O Moses, we will never believe you until we see Allah outright"; so the thunderbolt took you while you were looking on.

   2:55

Translation: Saheeh International