Leviticus 6:13 KJV
The fire shall ever be burning upon the altar; it shall never go out.
Leviticus 6:13, King James Version
In context
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.
14 And this is the law of the meat offering: the sons of Aaron shall offer it before the Lord, before the altar.