Leviticus 6:12 in the World English Bible
The fire on the altar shall be kept burning on it, it shall not go out; and the priest shall burn wood on it every morning. He shall lay the burnt offering in order upon it, and shall burn on it the fat of the peace offerings.
Context
11 And he shall put off his garments, and put on other garments, and carry forth the ashes without the camp unto a clean place.
12 And 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.
13 The fire shall ever be burning upon the altar; it shall never go out.