LEV45 Do not put olive oil into the flour of a meal offering that atones for sin. The Kohen shall not put olive oil on a flour (meal) offering brought by a poor man for atonement. Oil alludes to importance and greatness, for when poured into another liquid it always rises to the top. Owing to its great importance and value, it is used to anoint kings and Kohanim (priests), so it is not fitting to put oil into a flour offering of a person who has fallen into sin. After all, someone who has transgressed must exhibit concern, worry, and a humbled spirit, and feel crestfallen that such a thing came to his hand. In addition, Hashem shows pity on the poor, so when they have to bring an offering He does not trouble them to procure oil for it. For the same reason only a small amount of flour is required. Even the most unfortunate pauper as at least some flour in his possession.