The Jewish leaders were spiritually blind. Although they thought of themselves as teachers, they were unable to understand God's truth. See how you translated "blind guides" in [Matthew 15:14](../15/14.md). (See: [[rc://en/ta/man/jit/figs-metaphor]])
"is tied to his oath." The phrase "bound to his oath" is a metaphor for being required to do what one has said he would do in an oath. Alternate translation: "must do what he promised to do" (See: [[rc://en/ta/man/jit/figs-metaphor]])