DG to CUE: "what section of the bible defines sin? what is the biblical definition of sin? and what bible do you read..?"

***What Is Sin - AllAboutGOD.com
www.allaboutgod.com/what-is-sin.htm
The truth is that sin, as defined in the original translations of the Bible, means "to miss the mark."***

   CUE:  "The truth is that sin, as defined in the original translations of the Bible, means "to miss the mark." The mark, in this case, is the standard of perfection established by God and evidenced by Jesus. "   as per your view of what missing the mark is..  Viewed in that light, it is clear that we are all sinners."

Quoted  word for word ...  so your answer is that your biblical source is a web site called all about god. com...  the only other thing i will add is read paul scotts comment several times over , and we are all sinners because we are all human.