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What does the preface to the Ten Commandments teach us?
The preface to the Ten Commandments teaches us, that because God is the Lord, and our God and Redeemer, therefore we are bound to keep all His commandments.
Scripture Proofs
Luke 1:74-75
That he would grant unto us, that we being delivered out of the hand of our enemies might serve him without fear, In holiness and righteousness before him, all the days of our life.
1 Peter 1:17-18
Pass the time of your sojourning here in fear: Forasmuch as ye know that ye were not redeemed with corruptible things.