The fire. This fire was originally from heaven (9, 24), supernatural fire. Only this fire could be used to set fire to the incense on the golden altar. So only those who have atonement can pray or worship. Ever burning until rekindled by. special descent. [This is the origin of the perpetual light in Roman Catholic worship.] It was preserved till the destruction of the temple by Nebuchadnezzar; was one of the five things lacking in the second temple.
Related Commentaries of Leviticus 6:13
Leviticus 6:13
13 The fire shall ever be burning upon the altar; it shall never go out.