Moses
Leviticus 16:1ESV·traditional attribution

The LORD spoke to Moses after the death of the two sons of Aaron, when they drew near before the LORD and died,

John Calvin Reformed @genevareformer

1. And the Lord spake unto Moses. A copious description is here given of what we have recently adverted to cursorily, as it were, i.e., the solemn atonement which was yearly made in the seventh month; for when Moses was instructing them as to what sacrifices were to be offered on each of the festivals, he expressly excepted, though only in a single word, this...

Matthew Henry Presbyterian @wholebiblehenry

Here is, I. The date of this law concerning the day of atonement: it was after the death of the two sons of Aaron (Lev 16:1), which we read, Lev 10:1. 1. Lest Aaron should fear that any remaining guilt of that sin should cleave to his family, or (seeing the priests were so apt to offend) that some after-sin of his other sons should...

Commenting on Leviticus 16:1-4

John Gill Reformed Baptist @doctorgill

And the Lord spake unto Moses, after the death of the two sons of Aaron,.... That is, either immediately after their death, and so this chapter would have stood in its natural order next to the tenth; or else after the above laws concerning uncleanness on various accounts were delivered out, designed to prevent the people entering into the tabernacle defiled, whereby they would have...