What is the preface to the ten commandments? – Shorter Westminster Catechism

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.

Shorter Westminster Catechism

What is the sum of the ten commandments? – Shorter Westminster Catechism

What doth the preface to the ten commandments teach us? – Shorter Westminster Catechism