I'm not Muslim, so I can miss something obvious here. Reading the Quran I found that piece: http://quran.com/83/22
The translation is:
Indeed, the righteous will be in pleasure
On adorned couches, observing.
You will recognize in their faces the radiance of pleasure.
They will be given to drink [pure] wine [which was] sealed.
What is "a pure wine"? And why the righteous would drink it, considering sobriety is a virtue and all kinds of intoxication are denounced and forbidden, aren't they?