Leviticus 6:13-17

¹³And the fire shall always burn on the altar; it shall not be extinguished.

¹⁴This is the law of the sacrifice, which the sons of Aaron shall bring near before the Lord, before the altar.

¹⁵And he shall take from it a handful of the fine flour of the sacrifice with its oil, and with all its frankincense, which are upon the sacrifice; and he shall offer up on the altar a burnt offering as a sweet smelling savour, a memorial of it to the Lord.

¹⁶And Aaron and his sons shall eat that which is left of it: it shall be eaten without leaven in a holy place, they shall eat it in the court of the tabernacle of witness.

¹⁷It shall not be baked with leaven. I have given it as a portion to them of the burnt offerings of the Lord: it is most holy, as the offering for sin, and as the offering for trespass.