It's seems funny how fundee x-ians & others make this (another) assumption to bolster their faith. The O.T. writers may have been very careful in copying their works, but their is plenty of evidence of change: the two stories of creation in Genesis for example. As for the NT, plagarism was a common and acceptable practice in the Greco-Roman world when writing about events in the time of Jesus. No, I also don't think copying accuracy was practiced, because the manuscripts of NT writings that still exist are different from each other.