You are the Messiah with twelve, say 12 billiard balls.

One ball is odd. It is either lighter or heavier then the other eleven

You have the scales of justice, and with it you can weight the twelve three times.

At the end of the third weighing determine which is the odd ball, and whether it is lighter or
Heavier than the other eleven

Any help would be helpful, thanks.

Well, not a particularly stupid question.

The answer is here... good puzzle :)
http://www.mathsisfun.com/pool_balls_solution.html

If you need help understanding, please do not hesitate to ask!

Being the Messiah I think I would just use my divine powers to deduce the answer with zero weighings, but maybe that's just me.