Proverbs 23:13 Withhold not correction from the child: for if thou beatest him with the rod, he shall not die. 14 Thou shalt beat him with the rod, and shalt deliver his soul from hell.
[Patriarchs & Prophets pp 360] Nadab and Abihu had not in their youth been trained to habits of self-control. The father's yielding disposition, his lack of firmness for right, had led him to neglect the discipline of his children. His sons had been permitted to follow inclination. Habits of self-indulgence, long cherished, obtained a hold upon them which even the responsibility of the most sacred office had not power to break. They had not been taught to respect the authority of their father, and they did not realize the necessity of exact obedience to the requirements of God.
Aaron's mistaken indulgence of his sons prepared them to become the subjects of the divine judgments. God designed to teach the people that they must approach Him with reverence and awe, and in His own appointed manner. He cannot accept partial obedience. It was not enough that in this solemn season of worship nearly everything was done as He had directed. God has pronounced a curse upon those who depart from His commandments, and put no difference between common and holy things. He declares by the prophet: “Woe unto them that call evil good, and good evil; that put darkness for light, and light for darkness!
Woe unto them that are wise in their own eyes, and prudent in their own sight! ... which justify the wicked for reward, and take away the righteousness of the righteous from him! ... They have cast away the law of the Lord of hosts, and despised the word of the Holy One of Israel.” Isaiah 5:20-24. Let no one deceive himself with the belief that a part of God's commandments are nonessential, or that He will accept a substitute for that which He has required.
Matthew 5:19 Whosoever therefore shall break one of these least commandments, and shall teach men so, he shall be called the least in the kingdom of heaven: but whosoever shall do and teach them, the same shall be called great in the kingdom of heaven.
May God add His blessing to the study of His word. “Good night” and God bless!