This chapter would naturally have followed the tenth, where the death of Aaron's sons is related, if that event had not given occasion for declaring the forementioned laws about those uncleannesses that disqualified an Israelite for approaching the sanctuary.
Related Commentaries of Leviticus 16:1
Leviticus 16:1
1 And the LORD spake unto Moses after the death of the two sons of Aaron, when they offered before the LORD, and died;