In the remote region of Ghana where I lived as a boy, “Chop time, no friend” was a common proverb. Locals considered it impolite to visit at “chop time” (mealtime) because food was often scarce. The maxim applied to neighbors and outsiders alike.

            But in the Philippines, where I also lived for a time, even if you visit unannounced at mealtime, your hosts will insist on sharing with you regardless of whether they have enough for themselves. Cultures differ for their own good reasons.

            As the Israelites left Egypt, God provided specific instructions to govern their culture. But rules—even God’s…