Touching with respect to uncleanness is always expressed as the clean touching the unclean, since being clean imposes the obligation to keep one’s distance from the unclean and never the reverse.

And when it says the reverse וכל אשר יגע בו הזב (And whomsoever he that has the issue touches)⁶²⁶, the sages of blessed memory explain that it means there is a movement, that we find the verb נגע referring to moving a thing from its place.

footnotes: ⁶²⁶ Leviticus 15:11.

And moreover, with respect to holiness, it is proper to say that the holy touches the profane, since the holy needs to be cautious with the profane. And when it says the reverse וכל אשר יגע בבשרה (Whatsoever shall touch the flesh thereof shall be holy)⁶²⁷, they are forced to explain that it enters inside of it, that touching is about being attached to something else.

footnotes: ⁶²⁷ Leviticus 6:20.