Mark 7:2
"And when they saw some of his disciples eat bread with defiled, that is to say, with unwashen, hands, they found fault."
Cross References (ranked by relevance)
Acts 10:28
And he said unto them, Ye know how that it is an unlawful thing for a man that is a Jew to keep company, or come unto one of another nation; but God hath shewed me that I should not call any man common or unclean.
Romans 14:14
I know, and am persuaded by the Lord Jesus, that there is nothing unclean of itself: but to him that esteemeth any thing to be unclean, to him it is unclean.
Acts 11:8
But I said, Not so, Lord: for nothing common or unclean hath at any time entered into my mouth.