Leviticus 6:6 "There shall always be fire burning on the altar"

Many miracles happened in the Beit HaMikdash.

Among them was a heavenly fire that came down on the altar and burned the sacrifices.

This showed HaShem's acceptance of the service. Even though a divine fire appeared, the priests are commanded to light a man-made fire.

HaShem does not want us to rely on miracles.

Rather, we must do our part and perform the natural actions.

We will "light the flame" and HaShem will "keep it burning." (See also Negative Mitzvah 81).