Taha 20:22

وَٱضۡمُمۡ يَدَكَ إِلَىٰ جَنَاحِكَ تَخۡرُجۡ بَيۡضَآءَ مِنۡ غَيۡرِ سُوٓءٍ ءَايَةً أُخۡرَىٰ 22

And draw in your hand to your side; it will come out white without disease - another sign