It may refer to the Rod of Aaron from [Numbers 17:1-10][1]:

> <sup>10</sup> The Lord said to Moses, “Put back Aaron’s staff in front of the ark of the covenant law, to be kept as a sign to the rebellious. This will put an end to their grumbling against me, so that they will not die.” [NKJV]


  [1]: https://www.biblegateway.com/passage/?search=nu%2017&version=NKJV