Exodus 19:6
Authorized (King James) Version (AKJV)
6 and ye shall be unto me a kingdom of priests, and an holy nation. These are the words which thou shalt speak unto the children of Israel
I believe it was originally the will of God for Israel to be a nation of priests. But because of carnality, God had to use a plan B priesthood. (one tribe)
Same goes for us, If we dont realize our own "personal" priesthood, because of carnality, we will go find ourselves priests to minister to us and do our ministering for us.