Best-selling author Chaim Potok began his novel The Chosen by describing a baseball game between two Jewish teams in New York City.  Reuven Malter, the book’s main character, notices that the opposing players’ uniforms have a unique accessory—four long ropelike tassels that extend below each teammate’s shirt. Reuven recognizes the tassels as a sign of strict obedience to God’s Old Testament laws.

            The history of these fringes—known as tzitzit—began with a message from God. Through Moses, God told His people to create tassels containing some strands of blue thread and attach them to the four corners of their top garments (Num.…