There are none in the Bible. The closest you get are exhortations about work, or warnings about pursuing money. Some folks extrapolate from there, but the arguments against it are always indirect. More often than not, they're not scriptural at all, but are based on practical wisdom ("It destroys lives! It's unproductive!") that doesn't have a lot of basis in actual practice.
It's not anything like widespread enough that you could say it was a "Christian teaching," though. While you can still find people who say it's sinful (and you will always be able to), it's getting so that standard Southern Baptist Sunday School materials say, "Is Gambling a Sin? Well . . . not reeeeeaaallly . . . but we don't think it's a good idea." And I think those guys are usually just about the last to let go of issues like that.
It's not anything like widespread enough that you could say it was a "Christian teaching," though. While you can still find people who say it's sinful (and you will always be able to), it's getting so that standard Southern Baptist Sunday School materials say, "Is Gambling a Sin? Well . . . not reeeeeaaallly . . . but we don't think it's a good idea." And I think those guys are usually just about the last to let go of issues like that.