Charles Ellicott Commentary Leviticus 1:8

"and Aaron`s sons, the priests, shall lay the pieces, the head, and the fat, in order upon the wood that is on the fire which is upon the altar:" — Leviticus 1:8 (ASV)

Shall lay the parts. —Better, shall lay the pieces in order, as in Leviticus 1:12. The word here rendered by parts is the same which is more properly translated pieces in Leviticus 1:6. Here again, the priests are not to lay the pieces upon the altar haphazardly, but are to arrange them systematically. In consequence of the order expressed in this verse, the rule prevailed during the Second Temple that the parts of the victim should, as much as possible, be arranged in the same order which they occupied in the animal when alive.