Introduction:
The account of the death of Nadab and Abihu is a significant event in the Old Testament, illustrating the holiness of God and the importance of obedience to His commands. This event is recorded in the Book of Leviticus and serves as a sobering reminder of the consequences of deviating from divine instructions.

Biblical Account:
Nadab and Abihu were the sons of Aaron, the first high priest of Israel, and nephews of Moses. They were part of the priestly lineage, chosen to serve in the tabernacle, which was the dwelling place of God's presence among the Israelites. The narrative of their death is found in Leviticus 10:1-2:

"Now Aaron’s sons Nadab and Abihu took their censers, put fire in them, and added incense; and they offered unauthorized fire before the LORD, contrary to His command. So fire came out from the presence of the LORD and consumed them, and they died before the LORD." (Leviticus 10:1-2)

Context and Significance:
The incident occurred shortly after the consecration of the tabernacle and the ordination of Aaron and his sons as priests. The tabernacle was a sacred space, and the priests were given specific instructions on how to conduct their duties, including the offering of incense. The "unauthorized fire" (or "strange fire" in some translations) that Nadab and Abihu offered was not in accordance with the divine instructions given to them.

The exact nature of their transgression is not detailed, but it is clear that they acted presumptuously and without regard for the holiness of God. Their actions were a direct violation of the commandment to offer incense with fire taken from the altar, as specified in Leviticus 16:12. This disregard for God's explicit instructions resulted in their immediate death by divine fire.

Theological Implications:
The death of Nadab and Abihu underscores the holiness of God and the seriousness with which He views obedience to His commands. It serves as a powerful reminder that those who serve in positions of spiritual leadership are held to a high standard of conduct and reverence. The event highlights the principle that worship must be conducted according to God's terms, not human innovation or preference.

Furthermore, this incident illustrates the concept of God's justice and the consequences of sin. It emphasizes that God is not to be approached casually or with irreverence. The holiness of God demands respect and adherence to His instructions, especially in matters of worship and service.

Response of Aaron and Moses:
In the aftermath of the incident, Moses addressed Aaron, saying, "This is what the LORD meant when He said: 'I will show My holiness to those who are near Me, and I will reveal My glory before all the people.'" And Aaron remained silent. (Leviticus 10:3). Aaron's silence reflects his acceptance of God's judgment and the recognition of the gravity of the situation.

Moses instructed the relatives of Nadab and Abihu to carry their bodies outside the camp, emphasizing the need to maintain the sanctity of the tabernacle. Additionally, Aaron and his remaining sons, Eleazar and Ithamar, were instructed not to mourn publicly, as they were to continue their priestly duties and uphold the sanctity of their office.

Conclusion:
The death of Nadab and Abihu serves as a solemn warning about the importance of reverence and obedience in worship. It is a reminder of the holiness of God and the necessity for those who serve Him to do so with the utmost respect and adherence to His commands.