Albert Barnes Commentary Mark 7:20

"And he said, That which proceedeth out of the man, that defileth the man." — Mark 7:20 (ASV)

That which cometh out of the man. His words; the expression of his thoughts and feelings; his conduct, as the expression of inward malice, anger, covetousness, lust, etc.

Defileth the man. Is really polluted, or offensive in the sight of God. They render the soul corrupt and abominable in the sight of God. See Matthew 15:18-20.