International Standard Version Nothing that goes into a person from the outside can make him unclean. It's what comes out of a person that makes a person unclean.
American Standard Version there is nothing from without the man, that going into him can defile him; but the things which proceed out of the man are those that defile the man.
Young's Literal Translation there is nothing from without the man entering into him that is able to defile him, but the things coming out from him, those are the things defiling the man.