However the bible clearly condemns the love of money. So maybe that is what you are referring too?
Religious people use this phrase to make their believers to submit to that belief and donate a boundless amount of money for their religious activities. And since there is no way in the bible ever written that gambling is a sin, then I can conclude that gambling is not a sin and not immoral. Those who said that Bible said gambling is a sin and yet it is not written in it is face with serious problem.
Revelation 22:18
For I testify unto every man that heareth the words of the prophecy of this book, If any man shall add unto these things, God shall add unto him the plagues that are written in this book:
King James Bible
And that the Bible is the ultimate truth? Very much what's written is fiction. Gambling is a sin not for you. When you become bankrupt you are condemning your family to the poverty-stricken life. Isn't that a sin?