Nothing that enters a man from the outside can defile him; but the things that come out of a man, these are what defile him."
Cross References
Mark 7:14Once again Jesus called the crowd to Him and said, "All of you, listen to Me and understand:
Mark 7:16If any man have ears to hear, let him hear.
 Treasury of Scripture
There is nothing from without a man, that entering into him can defile him: but the things which come out of him, those are they that defile the man.
There.
nothing.
Mark 7:18-20
 And he saith unto them, Are ye so without understanding also? Do ye not perceive, that whatsoever thing from without entereth into the man, it cannot defile him; … 
Leviticus 11:42-47
 Whatsoever goeth upon the belly, and whatsoever goeth upon all four, or whatsoever hath more feet among all creeping things that creep upon the earth, them ye shall not eat; for they are an abomination… 
Acts 10:14-16,28
 But Peter said, Not so, Lord; for I have never eaten any thing that is common or unclean… 
but.
Mark 7:20-23
 And he said, That which cometh out of the man, that defileth the man… 
Proverbs 4:23
 Keep thy heart with all diligence; for out of it are the issues of life.
Matthew 12:34
 O generation of vipers, how can ye, being evil, speak good things? for out of the abundance of the heart the mouth speaketh.