Command Aaron and his sons, saying, This is the law of the burnt offering: It is the burnt offering, because of the burning upon the altar all night unto the morning, and the fire of the altar shall be burning on it.
All Commentaries on Leviticus 6:9 Go To Leviticus 6
Bede
AD 735
A holocaust is burned on the altar when a good work is performed with the burning fire of charity in the heart of any elect person who is devoted to God completely (that is, with both body and soul). This is done all night until the morning when one does not cease to persevere in good works throughout all the time of his life, until one is taken from the body and merits seeing the morning of the world to come. The fire will be on the same altar, because we ought to be burning with that charity alone which the Lord gives to his church through the Holy Spirit.