And the descendants of Aaron the kohen shall place fire on the altar, and arrange wood on the fire.Rashi notes on this verse "Even though the fire came down from heaven, it is a mitzvah to bring [fire] by layman"
Vayikra 1:7
So why does this verse instruct the Kohenim to put fire on the alter, and even add the means for the fire, the wood, when in fact this whole event is undertaken by a heavenly fire. Why not leave the fire on the alter to come from heaven?
