I just tagged a question about taking God's name in vain with commandments. Even though this question is just about one of the Ten Commandments, should it be tagged with ten-commandments, or is commandments okay? Should it be a singular form?
There are plenty of places where we're commanded to do/not do certain things. But the Ten Commandments are a well-known category of their own, so it would probably be a good idea to tag it as ten-commandments.
Maybe we should break this down to first-commandment, second-commandment?