I never knew why, but a quick google gave me this:markfiend wrote:You learn something new every day! I didn't know that. Just looked it up, and Matt 17:21 does not appear in the original Greek.
The KJV version of Matthew 17 includes verse 21, which has the same wording as Mark 9:29. The textual evidence shows that Matthew 17:21 was not in the original text of Matthew but was simply inserted by a later copiest to make Matthew's account agree with Mark's account of the story.
So now we know.
blimey - its getting a bit theological around here today isnt it?