Leviticus 6:13 in the King James Version
The fire shall ever be burning upon the altar; it shall never go out.
Context
12 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.
13 Fire shall be kept burning on the altar continually; it shall not go out.
14 “‘This is the law of the meal offering: the sons of Aaron shall offer it before the LORD, before the altar.