Question 49: What is the preface to the Ten Commandments?
Answer: The preface to the Ten Commandments is, “I am the Lord your God, who brought you out of the land of Egypt, out of the house of bondage.”
Scripture: Exodus 20:2.
Question 50: What does the preface to the Ten Commandments teach us?
Answer: The preface to the Ten Commandments teaches us that because God is the LORD, and our gracious Redeemer, his commandments are for our good and he does not will for us to depend on ourselves in keeping them, but to trust his grace and power.
The Baptist Catechism above was adapted by John Piper. This post in its entirety can be found at http://www.desiringgod.org/articles/a-baptist-catechism