What I found is that written evidence for knocking on wood (and for the history of gesture as a whole) is remarkably sparse. In the Penguin Guide to Superstitions, folklorist Steve Roud offers a skeptical take on the provenance of knocking on wood due to the near total absence of written records about it:
Undeterred by initial rejections, Paramount chief executive David Ellison launched a hostile takeover bid, taking his suit directly to shareholders, and on Thursday the fruits of that effort appeared.
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