“…. You leave the commandments of God and hold to the tradition of men.”
And he said to them, “You have a fine way of rejecting the commandment of God in order to establish your tradition! For Moses said, ‘Honour your father and your mother’; and ‘Whoever reviles father or mother must surely die.’ But you say, ‘If a man tells his father or his mother, “Whatever you would have gained from me is Corban”‘ (that is, given to God) – then you no longer permit him to do anything for his father or mother, thus making void the word of God by your tradition that you have handed down. And many such things you do.”
God revealed his commandments through Moses, but Jewish religion had traditions added by their ‘lamas’, the Pharisees.
Jesus points out the expert hypocrisy of the Pharisees. He does so by showing that their tradition of making a Corban vow to give money for the enrichment of the temple actually forces a man to disobey God’s command to honour one’s parents!