Seder 88: Answering Two Questions about Mark 7

 Mark 7 records a halakhic discussion in which Jesus engaged about a ritual hand-washing practice which was popular in his time.  Jesus was asked why his disciples didn't engage in this practice, which was based on the belief that ritual impurity could spread from a person's hands via a liquid to food, which would then make the person ritually unclean.  

Jesus expressed disagreement with this practice, which he classified as a human tradition that obscured rather than amplified the  teaching of the Torah.  He stated, "There is nothing outside a person that by going into him can defile him, but the things that come out of a person are what defile him" (v 15).  

Thinking about the rules for ritual purity in Leviticus 11-15, we can see what Jesus was talking about.  It is things that come out of a person---e.g., bodily fluids like blood and semen---that lead to ritual impurity, not anything a person ingests.  

At first glance, though, there seems to be a possible exception in Lev 17:15:  "And every person who eats what dies of itself or what is torn by beasts, whether he is a native or a sojourner, shall wash his clothes and bathe himself in water and be unclean until the evening; then he shall be clean."

Biblical scholar Logan Williams addresses this question in a 2024 paper in the journal New Testament Studies.  He explains that the uncleanness may be contracted from handling the dead animal rather than from ingesting the meat.  

Williams also looks at another question about Mark 7, the interpretation of Mark 7:18-19.  He says that here Jesus is saying that the human digestive system is a ritual cleansing agent.  Whenever a person eats meat, one has contact with a dead animal, but eating meat does not, according to Leviticus, lead to ritual impurity.  One way of explaining why that is is to see the digestive system as ritually cleansing the meat. 

A number of English translations of Mark 7:19 end the verse with a parenthetical "thus he declared all food clean."  Williams says that it's better to read that final clause as the end of the previous sentence, as in the KJV.  It's a trip through the digestive system that ritually cleanses the food, not a proclamation by Jesus.