Leviticus 6:11-13

Amplified Bible

¹¹ Then he shall take off his garments and put on something else, and take the ashes outside the camp to a (ceremonially) clean place. ¹² The fire on the altar shall be kept burning; it shall not [be allowed to] go out. The priest shall burn wood on it every morning, and he shall arrange the burnt offering on it and offer the fat portions of the peace offerings up in smoke on it. ¹³ The fire shall be burning continually on the altar; it shall not [be allowed to] go out.