# Any meat that touches an unclean thing must not be eaten

"No one may eat meat that touches something unclean"

# an unclean thing

Something that Yahweh has stated is unfit to touch or eat is spoken of as if it were physically unclean.

# It must be burned

"You must burn it" 

# anyone who is clean

A person who is acceptable for God's purposes is spoken of as if the person were physically clean.