وَٱضْمُمْ يَدَكَ إِلَىٰ جَنَاحِكَ تَخْرُجْ بَيْضَآءَ مِنْ غَيْرِ سُوٓءٍ ءَايَةً أُخْرَىٰ
Wadmum yadaka ilaa janaahika takhruj baidaaa'a min ghairi sooo'in Aayatan ukhraa
Now place your hand under your armpit and it will come out white, though unharmed: that is another sign.
And draw your hand close to your side — it will come out white, unblemished — another sign,