Leviticus 1:7 - Joseph Benson’s Commentary on the Old and New Testaments

The sons of Aaron shall put fire The fire was originally kindled from heaven, when the first sacrifices were offered, (Leviticus 9:24,) and was to be carefully preserved and kept burning, (Leviticus 6:13,) and therefore the expression of putting fire upon the altar is to be understood, not of kindling, but of feeding the fire with fresh fuel, or disposing and putting it in order.