There are a couple of explicit condemnations of gambling in the Qur'an, but not in the Bible [as far as I know, corrections welcome] - though things like condemnations of "love of money" might count as indirect condemnations of gambling, I suppose.
I recognise that some religious traditions take guidance from more than just the official holy books, but even the official Catholic view seems fairly neutral: that gambling is not immoral in itself, as long as certain conditions are met:
I recognise that some religious traditions take guidance from more than just the official holy books, but even the official Catholic view seems fairly neutral: that gambling is not immoral in itself, as long as certain conditions are met:
http://www.newadvent.org/cathen/06375b.htm