وَاضْمُمْ يَدَكَ إِلَى جَنَاحِكَ تَخْرُجْ بَيْضَاءَ مِنْ غَيْرِ سُوءٍ آيَةً أُخْرَى

Now clasp your hand to your armpit: it will emerge white, without any harm—[this is yet] another sign,