"Among those who approach me I will be proved holy; in the sight of all the people I will be honoured." (Leviticus 10:3)
Nadab and Abihu, Aaron's sons, take their censers, put fire in them and add incense, and offer unauthorised fire before the LORD, fire he had not commanded them to use. Fire comes out from the presence of the LORD and consumes them. Moses explains to Aaron: Among those who approach me I will be proved holy; in the sight of all the people I will be honoured. Aaron is silent. The sin of Nadab and Abihu is the sin of liturgical presumption: approaching the holy God on their own terms rather than his. The same divine fire that accepted Aaron's offering destroys unauthorized worship.
God then forbids Aaron and his remaining sons to mourn or drink wine when they enter the tent of meeting, and gives the reason: you must distinguish between the holy and the common, between the unclean and the clean. The Catechism identifies the holiness of God as the first truth that authentic worship must acknowledge: God is not managed or manipulated; he is approached on his own terms, in the manner he has prescribed, with the reverence his holiness demands (CCC 2807). The death of Nadab and Abihu is a severe mercy: it establishes at the outset of the priestly ministry that proximity to the holy is not a privilege to be presumed.
Brothers and sisters, we are not free to invent the terms on which we approach God. The freedom of the Gospel is not liturgical improvisation; it is the freedom of children who know their Father and approach him accordingly. The God who receives our worship is the same God who consumed Nadab and Abihu. Come with joy and with reverence.
Lord God, you are holy and you will be honoured among those who approach you. Let our worship be offered on your terms, not ours. Purify our liturgy of presumption and fill it with the reverence that your holiness requires. Through Christ our Lord. Amen.