Jesus challenged them in what they described as a gift (Corban) to God in Matthew 11:5. A Corban represented an offering an made to God, withdrawn from its originally intended use, and no longer available for persons, not even for those in need. They said one could avoid honouring their father and mother (providing financial support to them) by offering a Corban. Once something was designated a Corban no one else could benefit from it other than the person who designated it. In doing this they were violating the commandment of God making it ineffective.