Leviticus 14:21

But if he be poor, and not of ability to furnish this, he shall take one lamb for the trespass which he hath committed, that it may be set apart as a dedication, so that atonement may be made for him, and a tenth of fine flour tempered with oil for a sacrifice, and a cotulus of oil,

And if he should be poor, and cannot afford so much, he shall take one lamb for his transgression for a separate-offering, so as to make propitiation for him, and a tenth deal of fine flour mingled with oil for a sacrifice, and one cup of oil,