Then Aaron’s sons Nadab and Abihu made a mistake. They took their incense dishes and put some fire and incense in them. But they did not use the fire that was on the altar—they took fire from some other place and brought it to the Lord. This was not what he had commanded.
“Once a year Aaron must make a special sacrifice. He will use the blood of the sin offering to erase the sins of the people. He will do this at the horns of this altar. This day will be called the Day of Atonement, and it will be a very special day for the Lord.”