"And Nadab and Abihu, the sons of Aaron, took either of them his censer, and put fire therin, and put incense thereon, and offered strange fire before the LORD, which he commanded them not. And there went out fire from the LORD, and devoured them, and they died before the LORD." - Leviticus 10:1 & 2
The following sermons are on Leviticus 10:1 & 2:
The Young Christian Discerning the Errors of Contemporary Worship, by Rev. Ian Goligher
The Marks of a Healthy Church: Public Worship, by Dr. David P. Murray
Psalms Only in Worship? by Rev. Allan Murray
The Death of Nadab and Abihu, by Rev. John Greer, Part 1
The Death of Nadab and Abihu, by Rev. John Greer, Part 2