Dr. Luther’s Small Catechism lesson for the week of August 10, 2014:
[I] THE TEN COMMANDMENTS
As the head of the family should teach them
in a simple way to his household.
THE THIRD COMMANDMENT
“Remember the Sabbath day by keeping it holy.”
What does this mean?
Answer: We should fear and love God so that we do not despise preaching and His Word, but hold it sacred and gladly hear and learn it. 
Tappert, T. G. 2000, c1959. The book of concord : The confessions of the evangelical Lutheran church. Fortress Press: Philadelphia