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:
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When is West Indies vs. South Africa?West Indies vs. South Africa in the 2026 T20 World Cup starts at 4:30 a.m. ET on Feb. 26. This game takes place at the Narendra Modi Stadium.