Matthew 15:1-6 Then the scribes and Pharisees who were from Jerusalem came to Jesus, saying, 'Why do Your disciples transgress the tradition of the elders? For they do not wash their hands when they eat bread.' He answered and said to them, 'Why do you also transgress the commandment of God because of your tradition? For God commanded, saying, 'Honor your father and your mother'; and, 'He who curses father or mother, let him be put to death.' But you say, 'Whoever says to his father or mother, 'Whatever profit you might have received from me is a gift to God" then he need not honor his father or mother.' Thus you have made the commandment of God of no effect by your tradition.
Matthew 15:16-20 So Jesus said, “Are you also still without understanding? Do you not yet understand that whatever enters the mouth goes into the stomach and is eliminated? But those things which proceed out of the mouth come from the heart, and they defile a man. For out of the heart proceed evil thoughts, murders, adulteries, fornications, thefts, false witness, blasphemies. These are the things which defile a man, but to eat with unwashed hands does not defile a man."
Exodus 30:17-21 Then the LORD spoke to Moses, saying: “You shall also make a laver of bronze, with its base also of bronze, for washing. You shall put it between the tabernacle of meeting and the altar. And you shall put water in it, for Aaron and his sons shall wash their hands and their feet in water from it. When they go into the tabernacle of meeting, or when they come near the altar to minister, to burn an offering made by fire to the LORD, they shall wash with water, lest they die. So they shall wash their hands and their feet, lest they die. And it shall be a statute forever to them—to him and his descendants throughout their generations.”
Haggai 2:11-14 "Thus says the LORD of hosts: "Now, ask the priests concerning the law, saying, "If one carries holy meat in the fold of his garment, and with the edge he touches bread or stew, wine or oil, or any food, will it become holy?""" Then the priests answered and said, "No." And Haggai said, "If one who is unclean because of a dead body touches any of these, will it be unclean?" So the priests answered and said, "It shall be unclean." Then Haggai answered and said, ""So is this people, and so is this nation before Me," says the LORD, "and so is every work of their hands; and what they offer there is unclean.
Matthew 15:10-12 When He had called the multitude to Himself, He said to them, “Hear and understand: Not what goes into the mouth defiles a man; but what comes out of the mouth, this defiles a man.” Then His disciples came and said to Him, “Do You know that the Pharisees were offended when they heard this saying?”
Mark 7:1-4 Then the Pharisees and some of the scribes came together to Him, having come from Jerusalem. Now when they saw some of His disciples eat bread with defiled, that is, with unwashed hands, they found fault. For the Pharisees and all the Jews do not eat unless they wash their hands in a special way, holding the tradition of the elders. When they come from the marketplace, they do not eat unless they wash. And there are many other things which they have received and hold, like the washing of cups, pitchers, copper vessels, and couches.
Mark 7:14-23 When He had called all the multitude to Himself, He said to them, "Hear Me, everyone, and understand: There is nothing that enters a man from outside which can defile him; but the things which come out of him, those are the things that defile a man. If anyone has ears to hear, let him hear!" When He had entered a house away from the crowd, His disciples asked Him concerning the parable. So He said to them, "Are you thus without understanding also? Do you not perceive that whatever enters a man from outside cannot defile him, because it does not enter his heart but his stomach, and is eliminated, thus purifying all foods?" And He said, "What comes out of a man, that defiles a man. For from within, out of the heart of men, proceed evil thoughts, adulteries, fornications, murders, thefts, covetousness, wickedness, deceit, lewdness, an evil eye, blasphemy, pride, foolishness. All these evil things come from within and defile a man."