Concerning Sabbath observance in the Old Testament, Leviticus 23:3 says there was to be a holy convocation (assembly) on the Sabbath. While we don't know exactly what took place during these assemblies, Nehemiah 8:1-8 describes a service on a Holy Day—also a holy convocation. This assembly included reading from the Scriptures and having trained men explain the meaning of the Scriptures—the same things we do at our Sabbath services today.