1) The passage discusses the eighth day after the ordination of Aaron and his sons as priests, seen as beginning their formal worship and duties after a period of transition.
2) It describes the first sacrifices performed by Aaron according to God's commands, including a purification offering by Aaron. God's presence appears after the offerings are consumed by divine fire.
3) The passage then describes the death of Nadab and Abihu for bringing unauthorized fire, seen as a sign of God's holiness, and Aaron's silence in response, emphasizing his commitment to his duties as high priest.