Leviticus 5:7, 11

‘If he is not able to bring a lamb, then he shall bring to the LORD, for his trespass which he has committed, two turtledoves or two young pigeons: one as a sin offering and the other as a burnt offering.

‘But if he is not able to bring two turtledoves or two young pigeons, then he who sinned shall bring for his offering one-tenth of an ephah of fine flour as a sin offering. He shall put no oil on it, nor shall he put frankincense on it, for it is a sin offering.