To capture all Islam--and I gather that is what we fear--the man must be of the Koreish, the tribe of the Prophet himself.' 'But how could any impostor prove that?
For I suppose he's an impostor.' 'He would have to combine a lot of claims.

His descent must be pretty good to begin with, and there are families, remember, that claim the Koreish blood.

Then he'd have to be rather a wonder on his own account--saintly, eloquent, and that sort of thing.

And I expect he'd have to show a sign, though what that could be I haven't a notion.' 'You know the East about as well as any living man.

Do you think that kind of thing is possible ?' I asked.
'Perfectly,' said Sandy, with a grave face.
'Well, there's the ground cleared to begin with.