“And Aaron was an hundred and twenty and three years old when he died in mount Hor.”
Numbers 33:39 KJV
Aaron and his descendants were high priests in the old covenant of law. But after the temple in Jerusalem was destroyed in 70AD, the office of the Levitical high priest finished too. In the new covenant, Christ is now and forever our royal Priest like Melchizedek, as promised by God in an oath: “And all this is made even clearer if there was another King-Priest raised up with the rank of Melchizedek. This King-Priest did not arise because of a genealogical right under the law to be a priest, but by the power of an indestructible, resurrection life! For it says in the Psalms, You are like Melchizedek, a King-Priest forever!” That is why Christ is able also to save us to the uttermost that come to God by Him, seeing He ever lives to make intercession for us who believe in Him. Believe in the Lord Jesus Christ and you will live forever in Him. Amen!