"Walk in" here is a metaphor for "obey." The Pharisees and scribes asked this question to challenge Jesus' authority. This can be written as a statement. Alternate translation: "Your disciples should not disobey the traditions of our elders by eating their bread with unwashed hands." (See: [[rc://en/ta/man/translate/figs-rquestion]] and [[rc://en/ta/man/translate/figs-metaphor]])