Part it in pieces - Break, not cut. The Bedouins are in the habit of breaking up their cakes when warm and mixing the fragments with butter when that luxury can be obtained.

Thou shalt part it in pieces,.... This answered to the dividing of the pieces of the burnt offering, Leviticus 1:6 and signified the same thing; See Gill on Leviticus 1:6, Leviticus 1:12 All meat offerings, it is said (l), that were prepared in a vessel, were obliged to be cut to pieces; the meat offering of an Israelite, one (cake) was doubled into two, and two into four, and then divided, each piece was about the quantity of an olive:
and pour oil thereon; after parted into pieces; see Gill on Leviticus 2:4.
it is a meat offering; as well as that of fine flour, or that which was baked in an oven.
(l) Misn. Menachot, c. 6. sect. 4. Maimon. Maaseh Hakorbanot, c. 13. sect. 10.

part it in pieces, and pour oil thereon--Pouring oil on bread is a common practice among Eastern people, who are fond of broken bread dipped in oil, butter, and milk. Oil only was used in the meat offerings, and probably for a symbolic reason. It is evident that these meat offerings were previously prepared by the offerer, and when brought, the priest was to take it from his hands and burn a portion on the altar.

In pieces - Because part of it was offered to God, and part given to the priests.