WSC 43-44 -- Rules for the Redeemed

Question: What is the preface to the ten commandments?
Answer: The preface to the ten commandments is in these words, I am the Lord thy God, which have brought thee out of the land of Egypt, out of the house of bondage.
Question: What doth the preface to the ten commandments teach us?
Answer: The preface to the ten commandments teacheth us, that because God is the Lord, and our God, and Redeemer, therefore we are bound to keep all his commandments.