We just learned the Seventh Commandment, about not stealing.
The eighth commandment that God gave to Moses is:
You shall not give false testimony against your neighbor.
This means you shouldn't lie.
(from: wikisource - Luther's Small Catechism)
![eighth commandment](https://upload.wikimedia.org/wikipedia/commons/thumb/e/eb/8_Gebot_%28Lucas_Cranach_d_A%29.jpg/529px-8_Gebot_%28Lucas_Cranach_d_A%29.jpg)
(from: wikipedia - thou shalt not bear false witness against thy neighbour)