Matthew 15:
He didn't. Mark gave more details in Chapter 7:
The Greek word here rendered "defiled", literally signifies "common". The Pharisees prescribed a hand-washing procedure. Jesus and his disciples did not ceremonially follow that system.
Pulpit thought that they did wash their hands but not according to the procedure prescribed by the Pharisees:
Back to Matthew 15:
Why would Jesus speak against washing hands?1Then Pharisees and scribes came to Jesus from Jerusalem and said, 2“Why do your disciples break the tradition of the elders? For they do not wash their hands when they eat.”
He didn't. Mark gave more details in Chapter 7:
i.e., so-called unwashed.1 Now when the Pharisees gathered to him, with some of the scribes who had come from Jerusalem, 2they saw that some of his disciples ate with hands that were defiled, that is, unwashed
The Greek word here rendered "defiled", literally signifies "common". The Pharisees prescribed a hand-washing procedure. Jesus and his disciples did not ceremonially follow that system.
ESV footnote: Greek: unless they wash the hands with a fist, probably indicating a kind of ceremonial washing3 (For the Pharisees and all the Jews do not eat unless they wash their hands properly
i.e., the traditional procedureholding to the tradition of the elders,
Greek: unless they baptize; some manuscripts unless they purify themselves4and when they come from the marketplace, they do not eat unless they wash.
They were overdoing the washing ceremonies.And there are many other traditions that they observe, such as the washing of cups and pots and copper vessels and dining couches.)
Then Jesus proceeded to explain to them that they did not eat with defiled hands.5And the Pharisees and the scribes asked him, “Why do your disciples not walk according to the tradition of the elders, but eat with defiled hands?”
Pulpit thought that they did wash their hands but not according to the procedure prescribed by the Pharisees:
The Pharisees were watching and nitpicking.St. Mark explains the meaning of the word κοιναῖς (literally, common), by the word (ἀνίπτοις) "unwashen." The disciples, doubtless, washed their hands, but they abstained from the multiplied ceremonial washings of the Pharisees, which they had received by tradition and punctiliously observed. The scribes and Pharisees, who had come from Jerusalem, were doubtless sent as spies, to watch and to report in no friendly spirit the proceedings of the great Prophet of Nazareth.
Back to Matthew 15:
Jesus wasn't against washing hands; he was against the practice of washing hands ritualistically as a doctrine to worship God. You can wash your hands any time you want but it is not a form of worship.1Then Pharisees and scribes came to Jesus from Jerusalem and said, 2“Why do your disciples break the tradition of the elders? For they do not wash their hands when they eat.” 3He answered them, “And why do you break the commandment of God for the sake of your tradition? 4For God commanded, ‘Honor your father and your mother,’ and, ‘Whoever reviles father or mother must surely die.’ 5But you say, ‘If anyone tells his father or his mother, “What you would have gained from me is given to God,” 6he need not honor his father.’ So for the sake of your tradition you have made void the wordb of God. 7You hypocrites! Well did Isaiah prophesy of you, when he said:
8“‘This people honors me with their lips, but their heart is far from me; 9in vain do they worship me, teaching as doctrines the commandments of men.’”
Jesus did not recommend anyone to eat with filthy hands and Jesus ate with his hands without using any fork.Surely he knew that this was of great health benefit. He might have had an issue with the ritual but why do you think he would speak against a practice that would save many lives?