It's been said that properly understanding the Covenant at Sinai is the most difficult task in the study of divinity.  What do we make of it?  The goal of these resources is to help you understand.  I learned a ton as I studied through this topic myself for over two years.  There are two resources here: The first is a relevant section on the Mosaic Covenant by a Puritan named Francis Roberts; and the second is the official report of the OPC (Orthodox Presbyterian Church) on the study of Republication.  The OPC report comes to the same conclusions we have about the Mosaic Covenant.