[TruthInThoughtWordAndDeed]

The whole story is in dispute. The earliest copies of the New Testament scriptures do NOT include any of the story from which the casting of stones quotes are drawn.

[Springfield Reformer]

And yet there are substantial arguments for believing it to be part of the original Gospel of John:

http://books.google.com/books?id=_caHAAAAQBAJ&pg=PA60&lpg=PA60&dq=woman+adultery+john+8+vaticanus+byzantine&source=bl&ots=XvZ5p_HlMd&sig=tJ_EVt6oyflpO5LN5hTUQHtYkjY&hl=en&sa=X&ei=ojNEU5DUIMWH2AWysYH4Bw&ved=0CDcQ6AEwCQ