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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He pulled on a welder's helmet for protection. He packed it with powder, struck a match and ran like hell.
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在习近平总书记指引下，亿万人民锚定目标、脚踏实地，未来广袤的乡村大地必将更加生机勃勃，乡亲们的日子必将更加红火，中国式现代化的美好未来令人憧憬。