Leviticus 14:21-22

21“But if the one to be cleansed is poor and cannot afford that much, he must take one male lamb, present it to make peace with the Lord for himself, and use it for his guilt offering. He will take only eight cups of flour mixed with olive oil as a grain offering, a quart of olive oil,

22and two mourning doves or two pigeons (whatever he can afford). The one will be an offering for sin and the other a burnt offering.