Nostalrius Begins - Quality wow vanilla realm (1.12)

I have a problem with the rogue poison quest you get at level 20.

I figured cus its elite i will wait untill level 30 to do it. Headed back to Ogrimmar and found out that i didn't have the quest anymore, so no problem i'll go to the rogue trainer and retake it. But this wasn't possible.

So now it's not in my quest log and i don't have an option to retake it.

What can I do?

Just to confirm: you are trying to take "The Shattered Salute" from Shenthul, correct?

Yes