From the Heidelberg Catechism, for the Lord’s Day, October 6

The Sixth Commandment

“You shall not murder.

105. What does God require in the sixth Commandment?

That I do not revile, hate, insult, or kill my neighbor either in thought, word, or gesture, much less in deed, whether by myself or by another, but lay aside all desire of revenge; moreover, that I do not harm myself, nor willfully run into any danger. Wherefore also to restrain murder the magistrate is armed with the sword.