The fire must always be burning on the altar. It must never go out.
"These are the instructions for the grain offering. Aaron's sons must bring it into the LORD's presence in front of the altar.
One of them will remove a handful of flour from the grain offering, together with the olive oil and all the incense. He will burn it on the altar as a reminder. It is a soothing aroma to the LORD.
Aaron and his sons will eat the rest of it. They will eat unleavened bread in a holy place, in the courtyard of the tent of meeting.
Don't use yeast in baking the bread. I have given it to them as their share from the offerings by fire made to me. It is very holy like the offering for sin and the guilt offering.
Every male descendant of Aaron may eat it. It is a permanent law for generations to come regarding the offering by fire to the LORD. Everyone who touches it will become holy."
The LORD spoke to Moses,
"This is the offering that Aaron and his sons must bring to the LORD on the day he is anointed--eight cups of flour. They must do this every day. He must offer half of it in the morning and half in the evening.
Prepare it in a frying pan with olive oil, mixing it well. Offer baked pieces of the grain offering as a soothing aroma to the LORD.
Aaron's son who is anointed to take his place as priest will prepare it. This is a permanent law of the LORD: It must be completely burned.
Every grain offering made by a priest must be completely burned. It must not be eaten."