...That which is left

Leviticus 2:10 ...that which is left

Oil, of course, as a type of the Holy Spirit, is used in making this "meat/meal offering."
And "that which is left..." (belongs to)

1. Aaron and his sons (the priests)
2. ...is a thing most holy of all other offerings
3. ...is of the Lord made by fire.

Just as one realizes the burnt offering of our will is His to "use to pieces" according to His good pleasure (1.6); Meal/flour/bread as a type of the WORD in our hearts and lives ('daily bread')

1. comes from Him to us in revealed parts
2. is indeed "Holy" ...the WORD made flesh and dwelt among us (Jn 1.14)
3. all works are tried or revealed by fire (I Cor 3.13, I Pet 1.7) 

In this writer's most humble understanding, "...that which is left" is one's flesh to be used of God as HE wills, since HE gave ALL, then, we are "what is left."