Jesus waited until his brothers left, then secretly slithered around to see what they were up to, thus setting the example for modern-day dub elders to spy on their flock to see who is up to no good.
Lies for the sake of truth are just great, aren't they? It's also known as "the end justifies the means," a principle used for many noble purposes.
Inspires undying faith and implicit trust, doesn't it?