One of the most effective teaching tools in the classroom is the use of examples. For instance, calculus, physics, and chemistry students on university campuses purchase very large books that contain examples of how to solve various problems they may encounter in their course of study. When it comes to our spiritual instruction, God sometimes uses examples to teach us about obedience. God used the Rechabites, a nomadic tribe who faithfully adhered to a strict set of rules, to demonstrate to His people what faithful obedience looks like.