Leviticus 6:12

9 “Command Aaron and his sons that this is the law of the burnt offering: The burnt offering is to remain on the hearth of the altar all night, until morning, and the fire must be kept burning on the altar.

10 And the priest shall put on his linen robe and linen undergarments, and he shall remove from the altar the ashes of the burnt offering that the fire has consumed and place them beside it.

11 Then he must take off his garments, put on other clothes, and carry the ashes outside the camp to a ceremonially clean place.

12 The fire on the altar shall be kept burning; it must not be extinguished. Every morning the priest is to add wood to the fire, arrange the burnt offering on it, and burn the fat portions of the peace offerings on it.

13 The fire shall be kept burning on the altar continually; it must not be extinguished.

14 Now this is the law of the grain offering: Aaron’s sons shall present it before the LORD in front of the altar.

15 The priest is to remove a handful of fine flour and olive oil, together with all the frankincense from the grain offering, and burn the memorial portion on the altar as a pleasing aroma to the LORD.