Cross reference
Luke 11:38
38 When the Pharisee saw it, he marveled that he had not first washed himself before dinner.
Matthew 15:2-3
2 "Why do your disciples disobey the tradition of the elders? For they don't wash their hands when they eat bread."
3 He answered them, "Why do you also disobey the commandment of God because of your tradition?
Mark 7:2-5
2 Now when they saw some of his disciples eating bread with defiled, that is, unwashed, hands, they found fault.
3 (For the Pharisees, and all the Jews, don't eat unless they wash their hands and forearms, holding to the tradition of the elders.
4 They don't eat when they come from the marketplace, unless they bathe themselves, and there are many other things, which they have received to hold to: washings of cups, pitchers, bronze vessels, and couches.)
5 The Pharisees and the scribes asked him, "Why don't your disciples walk according to the tradition of the elders, but eat their bread with unwashed hands?"
John 3:25
25 There arose therefore a questioning on the part of John's disciples with some Jews about purification.