Leviticus 6:11-14

¹¹And he shall put off his garments, and put on other garments, and carry forth the ashes without the camp unto a clean place.

¹²And the fire upon the altar shall be burning in it; it shall not be put out: and the priest shall burn wood on it every morning, and lay the burnt offering in order upon it; and he shall burn thereon the fat of the peace offerings.

¹³The fire shall ever be burning upon the altar; it shall never go out.

¹⁴And this is the law of the meat offering: the sons of Aaron shall offer it before the LORD, before the altar.