Matthew 15:6

Ye have made void the word of God (ekurwsate ton logon tou qeou). It was a stinging indictment that laid bare the hollow pretence of their quibbles about handwashing. Kuro means force or authority, akuro is without authority, null and void. It is a late verb, akurow but in the LXX, Galatians 3:17 ; and in the papyri Adjective, verb, and substantive occur in legal phraseology like cancelling a will, etc. The moral force of God's law is annulled by their hairsplitting technicalities and immoral conduct.