“ ‘Suppose someone touches the man who has the flow of liquid body waste. Then they must wash their clothes. They must take a bath. They will be “unclean” until evening.
“ ‘Suppose someone is “clean.” And suppose the man who has the flow of liquid waste spits on them. Then they must wash their clothes. They must take a bath. They will be “unclean” until evening.
Or suppose he touches any crawling thing that makes him “unclean.” Or suppose he touches any person who makes him “unclean.” It does not matter what “unclean” thing he touches. It will make him “unclean.”