Mark 7:17-19

When he was back home after being with the crowd, his disciples said, “We don’t get it. Put it in plain language.” Jesus said, “Are you being willfully stupid? Don’t you see that what you swallow can’t contaminate you? It doesn’t enter your heart but your stomach, works its way through the intestines, and is finally flushed.” (That took care of dietary quibbling; Jesus was saying that all foods are fit to eat.)