Leviticus 10:1 And Nadab and Abihu, the sons of Aaron, offered strange fire before the Lord. 2 And there went out fire from the Lord, and devoured them, and they died before the Lord. 3 Then Moses said unto Aaron, This is it that the Lord spake, saying, I will be sanctified in them that come nigh me, and before all the people I will be glorified. And Aaron held his peace.
[Patriarchs & Prophets pp 426] When his two sons were slain for disregarding God's express command, he did not rebel or even murmur. Yet the record of his noble life had been marred. Aaron committed a grievous sin when he yielded to the clamors of the people and made the golden calf at Sinai; and again, when he united with Miriam in envy and murmuring against Moses. And he, with Moses, offended the Lord at Kadesh by disobeying the command to speak to the rock that it might give forth its water. God intended that these great leaders of His people should be representatives of Christ. Aaron bore the names of Israel upon his breast. He communicated to the people the will of God.
He entered the most holy place on the Day of Atonement, “not without blood,” as a mediator for all Israel. He came forth from that work to bless the congregation, as Christ will come forth to bless His waiting people when His work of atonement in their behalf shall be ended. It was the exalted character of that sacred office as representative of our great High Priest that made Aaron's sin at Kadesh of so great magnitude. With deep sorrow Moses removed from Aaron the holy vestments, and placed them upon Eleazar, who thus became his successor by divine appointment.
For his sin at Kadesh, Aaron was denied the privilege of officiating as God's high priest in Canaan—of offering the first sacrifice in the goodly land, and thus consecrating the inheritance of Israel. Moses was to continue to bear his burden in leading the people to the very borders of Canaan. He was to come within sight of the Promised Land, but was not to enter it. Had these servants of God, when they stood before the rock at Kadesh, borne unmurmuringly the test there brought upon them, how different would have been their future! A wrong act can never be undone. It may be that the work of a lifetime will not recover what has been lost in a single moment of temptation or even thoughtlessness.
1st Peter 5:8 Be sober, be vigilant; because your adversary the devil, as a roaring lion, walketh about, seeking whom he may devour: 9 Whom resist steadfast in the faith, knowing that the same afflictions are accomplished in your brethren that are in the world.
May The Lord add His blessing to the study of His word. God bless!