Leviticus 14:20-21

²⁰And put it on the altar with the libations thereof, and the man shall be rightly cleansed.

²¹But if he be poor, and his hand cannot find the things aforesaid: he shall take a lamb for an offering for trespass, that the priest may pray for him, and a tenth part of hour tempered with oil for a sacrifice, and a sextary of oil,