Ryken, Leland, James C. Wilhoit and Tremper Longman III, eds.  “Aaron’s Rod.”  In Dictionary of Biblical Imagery, 1.  Downers Grove, IL: InterVarsity Press, 1998. [Israel/Tabernacle/Priesthood/Symbolism/Kingship/Furnishings]

Following the miraculous uses of Aaron’s Rod it was placed in the Holy of Holies in the Tabernacle as a memorial (Num. 20:9) It is associated with and symbolizes authority and power: supernatural power, power to “transform physical reality,” political and priestly authority and as a scepter-like instrument of royalty.  Its blossoming coincided with the establishment of the house of Aaron and the tribe of Levi in priestly roles.  Being housed in the Holy of Holies gave it “sacral significance.”