What is the ninth commandment?
The ninth commandment is: You shall not bear false witness against your neighbor. Read about the other variation of the 9th commandment at http://www.answers.com/topic/ten-commandments
The sixth commandment is thou shalt not commit adultery and the ninth commandment is thou shalt not covet thy neighbor's wife. The sixth commandment refers to actions, but the ninth commandment refers to the rightness of your heart. Actually, if you never broke the ninth commandment, you'd never break the sixth one either.
The 6th commandment is about committing adultery. The 9th commandment is about coveting anothers partner or thinking about it and being jealous and wanting to but not necessarily playing out those fantasies. Actually, most Christian religions say the sixth commandment is "thou shalt not kill", while the ninth is "thou shalt not bare false witness [or lie, as in be dishonest in speech]".
Catholic Answer To covet is to desire something, to desire (or lust) after something that you shouldn't be. The ninth commandment forbids us to covet our neighbor's wife - this obviously is covering all those sexual sins which are in our mind where we are lusting after someone who should not be an object of our desire. The tenth commandment covers covet of things: our neighbor's possessions. We are forbidden to desire things that…