We bring shame on God and the church of Jesus Christ when those called to uphold God’s righteousness go their own way, thus, despising God through their own acts. God did not spare those sons of Aaron because as priests, they were to lead Israel in true worship and uphold holy living in the camp. Rather than do this, they became bad examples to the congregation and they were judged instantly. This should be a warning and an example to all of us that God does not compromise on His words and standards and that indeed judgement will start from all those in positions of authority, that judgement will start from within the camp. (1Pet.4:17; Matt.25:14-30)
God by enacting the law concerning leprosy emphasized the need for holy and righteous living among His people. Through this God demonstrated the seriousness of sin — its effect on the spirit, soul and body. Therefore, we are to live our lives totally surrendered to Him—our spirit, soul and body to be complete in Him. “Don’t you realize that your body is the temple of the Holy Spirit who lives in you and was given to you by God? You don’t belong to yourself; for God bought you with a high price. So you must honour God with your body.” 1Cor.6:19-20 NLT. “Love God with your whole heart: love him with all that’s in you, love him with all you’ve got.” Deut. 6:5 MSG.
Aaron blessed the people after their sins had been atoned. It points to the fact that it’s only in righteousness and holiness that confirment of blessing is to abide with God’s people. Therefore, the born again child of God will be able to partake of God’s blessings only by abstaining from all appearances of (evil) sin. Lev.9:22