Leviticus 10:19
And Aaron said unto Moses, Behold, this day have they offered their sin offering and their burnt offering before the Lord; and such things have befallen me: and if I had eaten the sin offering to day, should it have been accepted in the sight of the Lord?
Cross-references
Leviticus 9:8
Historical context
Leviticus 9:8 records Aaron offering his own sin offering, while Leviticus 10:19 refers to the people's sin offering—both involve priestly handling of sin offerings.
Deuteronomy 26:14
Parallel
Deuteronomy 26:14 explicitly states not eating the tithe while in mourning, directly paralleling Aaron's reason for not eating the sin offering in Leviticus 10:19.
Hebrews 7:27
Contrast
Hebrews 7:27 contrasts Christ's once-for-all sacrifice with the old priests' need to offer for their own sins, relating to Aaron's dilemma in Leviticus 10:19.