t o teach when it is unclean, and when it is clean. This is the law of leprosy.
هَذِهِ الشَّرِيعَةُ لِلتَّفرِيقِ بَينَ ما هُوَ نَجِسٌ وَما هُوَ طاهِرٌ. إنَّها شَرِيعَةُ البَرَصِ وَالعَفَنِ.