Bible Dictionary
AARON'S ROD
Aaron’s rod miraculously budded, blossomed, and produced almonds as God’s sign of Aaron’s appointment to the priesthood. It was kept before the testimony as a lasting witness.
Biblical Usage
The sign confirmed Aaron’s divine appointment and priestly right after the rebellion against Moses and Aaron. It was kept before the testimony as a lasting token of God’s will; Hebrews mentions it in connection with the Holy of Holies and the ark.