Mattityahu 15:19-20

For out of the lev comes evil machshavot (thoughts): retzichot (murders), niufim (adulteries), zenunim (fornications), genevot (thefts), eduyot sheker (false testimonies), giddufim (revilements). These are the things making the man tameh, but eating with hands lacking the netilat yadayim (ritual of the washing of the hands), this does not make the man tameh.