Aaron shall make atonement upon its horns once a year; with the blood of the sin offering of atonement he shall make atonement for it once in the year throughout your generations; it is most holy to the Lord.”
Now Nadab and Abihu, the sons of Aaron, each took his censer, and put fire in it, and laid incense on it, and offered unholy fire before the Lord, such as he had not commanded them.