@hazlin @BowsacNoodle @King_Noticer As for the first and second points, St. Thomas Aquinas describes the distinction very well. The moral precepts of the Old Testament are in force, back then, now and forever. The ceremonial precepts are no longer in force, and are actually sinful to still follow. And the judicial precepts are not in force, but it is not sinful to follow them.

So the ten commandments, being moral precepts, are true, and are still in force even today. Performing the homosexual acts was sinful then and is still sinful now. But, the punishment prescribed for homosexuals back then no longer needs to be applied today, although a ruler may choose to still enact it today.

Just to fill out all the examples, one for a ceremonial precept would be circumcision. If you are getting yourself circumcised because God commanded this in the Old Testament and you believe you still must do this, that would be a sin. Although if you were to circumcise yourself for another reason this may not be sinful. On the other end, there was a prohibition against eating certain kinds of meats, such as pork or shellfish. This prohibition is no longer in force as it was ceremonial rather than moral. So these precepts can either be something you must do or must not do. But in either case if they are ceremonial, they are no longer in force. Thank you friend.