As DRK must I buy the same spells again??Follow

I am currently a 30BLM/11WHM. I will be pursuing the DRK job and will probably sub it w/ WAR or THF. I am basically wondering if I will have to buy the spells that I already have learned w/ my BLM such as Drain, Fire, Bio, etc....

As said in previous post, if you have used the scroll on a different class, you will not need to "relearn" it again. :)