The origin of gambling is considered to be divinatory: by casting marked sticks and other objects and interpreting the outcome, man sought knowledge of the future and the intentions of the gods. From this it was a very short step to betting on the outcome of the throws.
Although the Bible never actually calls gambling a sin, it does give us principles that guide the humble into wisdom on this topic. For example, Jesus said, No one can serve two masters.Either you will hate the one and love the other, or you will be devoted to the one and despise the other.