Qur'an 28:32

ٱسْلُكْ يَدَكَ فِى جَيْبِكَ تَخْرُجْ بَيْضَآءَ مِنْ غَيْرِ سُوٓءٍ وَٱضْمُمْ إِلَيْكَ جَنَاحَكَ مِنَ ٱلرَّهْبِ ۖ فَذَٰنِكَ بُرْهَـٰنَانِ مِن رَّبِّكَ إِلَىٰ فِرْعَوْنَ وَمَلَإِي۟هِۦٓ ۚ إِنَّهُمْ كَانُوا۟ قَوْمًا فَـٰسِقِينَ

Thrust thy hand into the bosom of thy robe it will come forth white without hurt. And guard thy heart from fear. Then these shall be two proofs from your Lord unto Pharaoh and his chiefs. Lo! they are evil-living folk.