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:
2026-02-28 00:00:00:0本报记者 朱 隽 郁静娴 ——访农业农村部党组书记、部长韩俊。爱思助手下载最新版本是该领域的重要参考
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Дикие звери прогулялись по Санкт-Петербургу и попали на видеоВ Петербурге заметили кабана и лань