Jesus said,

“You have let go of the commands of God and are holding on to human traditions."
And he continued, "You have a fine way of setting aside the commands of God in order to observe your own traditions!
For Moses said, 'Honor your father and mother,' and, 'Anyone who curses their father or mother is to be put to death.'
But you say that if anyone declares that what might have been used to help their father or mother is Corban (that is, devoted to God)—then you no longer let them do anything for their father or mother.
Thus you nullify the word of God by your tradition that you have handed down. And you do many things like that."
Mark 7:8-13, NIV

Mark 7:11
Corban (korban ho estin do¯ron). See note on Mat_15:5. Mark preserves the Hebrew word for a gift or offering to God (Exo_21:17; Lev_20:9), indeclinable here, meaning gift (do¯ron), but declinable korbanas in Mat_27:6, meaning sacred treasury. The rabbis (but ye say, humeis de legete) actually allowed the mere saying of this word by an unfaithful son to prevent the use of needed money for the support of father or mother. It was a home thrust to these pettifogging sticklers for ceremonial punctilios. They not only justified such a son’s trickery, but held that he was prohibited from using it for father or mother, but he might use it for himself.
Word Pictures in the New Testament, by Bible scholar A. T. Robertson