Martin Luther on the Eighth Commandment
You are not to bear false witness against your neighbor.
What is this? Answer:
We are to fear God, so that we do not tell lies about our neighbors, betray or slander them, or destroy their reputations. Instead we are to come to their defense, speak well of them, and interpret everything they do in the best possible light.
Martin Luther, from The Small Catechism, (1529).