The seven deadly sins do not occur as a list in scripture per se, but certainly each of these faults are demonstrated at a number of points for the evil they produce (though you can find most of them in Galatians 5:19ff (ff = more than one verse following).
Scripture does not have seven deadly sins, but rather one “deadly sin” - or rather sin itself, which is deadly - in that it corrupts what is good, destroying it like a cancer from the inside out. Scripture goes so far as to say that even if you do everything else right, any one sin will undo it all. [See James 2:10]
This puts each of us into the category of law-keeper or law-breaker, and because no one can claim to have kept all of the law and never stumbled once, aside from Christ himself, we all find ourselves in the law-breaker category.
Each of these sins begins in the mind and then leads into action. [James 1:14f]