When the Hebrew nation was organized at Sinai, a national sanctuary and services for the people were planned. Under God's guidance, Moses chose Aaron and his sons to serve as priests of the tabernacle. The priests were consecrated for this service by special ceremonies. The high priest was to be an especially holy man, with a spiritual charge to keep the children of Israel alert to their obligations to God.
According to the account in the Book of Numbers in the Bible, certain of the Israelites rebelled against the selection of Aaron and his house, and Moses was told by God how the choice might be confirmed. The direction which he received was that the chief of each of the twelve tribes should bring a rod with his name written upon it; Aaron's name was to be inscribed on the rod for the tribe of Levi. These rods, or boughs, were to be placed in the tabernacle, and God would send a sign which would indicate His approval of whoever was to hold the priestly office.
On the following morning, Moses went to gather up the rods. Whereas the others were still lifeless, we read that "the rod of Aaron for the house of Levi was budded, and brought forth buds, and bloomed blossoms, and yielded almonds" (17:8). Here was a sign from heaven! From that day there was no doubt that Aaron was the high priest chosen of God and that his sons were set apart for the priesthood.
