Leviticus 10:1-3

1Now 1Nadab and Abihu, the sons of Aaron, took their respective 2firepans, and after putting fire in them, placed incense on it and offered strange fire before the Lord, which He had not commanded them. 23And fire came out from the presence of the Lord and consumed them, and they died before the Lord. 3Then Moses said to Aaron, “It is what the Lord spoke, saying, ‘By those who 4come near Me I 56will be treated as holy, And before all the people I will 7be honored.’” So Aaron, therefore, kept silent.