If Aaron had had courage to stand for the right, irrespective of consequences, he could have prevented that apostasy. If he had unswervingly maintained his own allegiance to God, if he had cited the people to the perils of Sinai, and had reminded them of their solemn covenant with God to obey His law, the evil would have been checked. But his compliance with the desires of the people and the calm assurance with which he proceeded to carry out their plans, emboldened them to go to greater lengths in sin than had before entered their minds. {PP 323.1}
When Moses, on returning to the camp, confronted the rebels, his severe rebukes and the indignation he displayed in breaking the sacred tables of the law were contrasted by the people with his brother's pleasant speech and dignified demeanor, and their sympathies were with Aaron. To justify himself, Aaron endeavored to make the people responsible for his weakness in yielding to their demand; but notwithstanding this, they were filled with admiration of his gentleness and patience. But God seeth not as man sees. Aaron's yielding spirit and his desire to please had blinded his eyes to the enormity of the crime he was sanctioning. His course in giving his influence to sin in Israel cost the life of thousands. In what contrast with this was the course of Moses, who, while faithfully executing God's judgments, showed that the welfare of Israel was dearer to him than prosperity or honor or life. {PP 323.2}
Of all the sins that God will punish, none are more grievous in His sight than those that encourage others to do evil. God
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would have His servants prove their loyalty by faithfully rebuking transgression, however painful the act may be. Those who are honored with a divine commission are not to be weak, pliant time-servers. They are not to aim at self-exaltation, or to shun disagreeable duties, but to perform God's work with unswerving fidelity. {PP 323.3}
Though God had granted the prayer of Moses in sparing Israel from destruction, their apostasy was to be signally punished. The lawlessness and insubordination into which Aaron had permitted them to fall, if not speedily crushed, would run riot in wickedness, and would involve the nation in irretrievable ruin. By terrible severity the evil must be put away. Standing in the gate of the camp, Moses called to the people, "Who is on the Lord's side? let him come unto me." Those who had not joined in the apostasy were to take their position at the right of Moses; those who were guilty but repentant, at the left. The command was obeyed. It was found that the tribe of Levi had taken no part in the idolatrous worship. From among other tribes there were great numbers who, although they had sinned, now signified their repentance. But a large company, mostly of the mixed multitude that instigated the making of the calf, stubbornly persisted in their rebellion. In the name of "the Lord God of Israel," Moses now commanded those upon his right hand, who had kept themselves clear of idolatry, to gird on their swords and slay all who persisted in rebellion. "And there fell of the people that day about three thousand men." Without regard to position, kindred, or friendship, the ringleaders in wickedness were cut off; but all who repented and humbled themselves were spared. {PP 324.1}
Those who performed this terrible work of judgment were acting by divine authority, executing the sentence of the King of heaven. Men are to beware how they, in their human blindness, judge and condemn their fellow men; but when God commands them to execute His sentence upon iniquity, He is to be obeyed. Those who performed this painful act, thus manifested their abhorrence of rebellion and idolatry, and consecrated themselves more fully to the service of the true God. The Lord honored their faithfulness by bestowing special distinction upon the tribe of Levi. {PP 324.2}
Patriarchs and Prophets, Ellen G. White, pp.323 -324
P.S. Bolds added for emphasis. Blogman.