Leviticus 9:22-24; Leviticus 10:1-3

22 Then Aaron lifted up his hands toward the people and blessed them, and he stepped down after making the sin offering and the burnt offering and the peace offerings. 23 Moses and Aaron went into the tent of meeting. When they came out and blessed the people, the glory of the LORD appeared to all the people. 24 Then fire came out from before the LORD and consumed the burnt offering and the portions of fat on the altar; and when all the people saw it, they shouted and fell on their faces.
1 Now Nadab and Abihu, the sons of Aaron, took their respective firepans, and after putting fire in them, placed incense on it and offered strange fire before the LORD , which He had not commanded them. 2 And fire came out from the presence of the LORD and consumed them, and they died before the LORD . 3 Then Moses said to Aaron, "It is what the LORD spoke, saying, 'By those who come near Me I will be treated as holy, And before all the people I will be honored.' " So Aaron, therefore, kept silent.
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