Jamieson, Fausset and Brown on Leviticus 16:1

CHAPTER 16

Le 16:1-34. How the High Priest Must Enter into the Holy Place.

1. after the death of the two sons of Aaron, when they offered before the Lord, and died--It is thought by some that this chapter has been transposed out of its right place in the sacred record, which was immediately after the narrative of the deaths of Nadab and Abihu [Le 10:1-20]. That appalling catastrophe must have filled Aaron with painful apprehensions lest the guilt of these two sons might be entailed on his house, or that other members of his family might share the same fate by some irregularities or defects in the discharge of their sacred functions. And, therefore, this law was established, by the due observance of whose requirements the Aaronic order would be securely maintained and accepted in the priesthood.