Mar 7:9 Full well you reject the commandment of God, that you may keep your own tradition.
Alternative: Beautifully do you make divine orders ineffective so that you may guard your own transmission of orders.

When Christ seems to repeat a phrase, he never does so frivolously. He does it because it is easy to miss his meaning. My response is to look more closely at the Greek to see what I am missing.

In this case, what I found is that the word translated as "traditions" actually has a much most specific meaning in this context. The word doesn't mean "tradition" exactly. It means "to transmit," to "hand down" or "pass on" something, like legends or traditions are handed down from one generation to the next. However, in this context, it has a more specific meaning, referring specifically to the transmission of orders and the transmission of authority from one generation to the next.

What religious leaders are protecting is their ability to acts as the middlemen between God and their followers. Christ saw these middlemen as making God's message ineffective because what they emphasize is their power as priests rather than God's will. Hence, we have "house-keeping" tasks such as washing the dishes, taking precedence over more important matters.

In this discussion, it was the Pharisees who started this topic, condemning Christ's followers for not washing their hands as "handed down from the elders."

"Full well" is from kalos (kalos), which means "beautiful," "good," "of fine quality," "noble," and "honorable." It is most often translated as "good" juxtaposed with "evil" in the New Testament, but the two ideas are closer to "wonderful" and "worthless," "noble" and "base."

"Reject" is from atheteô (atheteo), which means "to deny," "to disprove," "to cancel," "to render ineffective," and to :break faith with."

"You may keep" is from têreô (tereo), which means "to watch over," "to guard," "to take care of," "to give heed to," "to keep," and "to observe."

"Tradition" is from paradosis (paradosis), which means "handing down," "transmission," "that which is handed down," and "the transmission of orders." This specifically includes legends, traditions, and doctrines but it is not specific about the quality of what is handed down, only that it has been passed down.