Leviticus 5:11

But if he cannot afford two turtledoves or two young pigeons, he may bring a tenth of an ephah of fine flour as a sin offering. He must not put olive oil or frankincense on it, because it is a sin offering.

Note A tenth of an ephah is approximately 2 dry quarts or 2.2 liters (probably about 2.6 pounds or 1.2 kilograms of flour).

BSB · Berean Standard Bible
But if he be not able to bring two turtledoves, or two young pigeons, then he that sinned shall bring for his offering the tenth part of an ephah of fine flour for a sin offering; he shall put no oil upon it, neither shall he put any frankincense thereon: for it is a sin offering.
KJV · King James Version
“‘But if he can’t afford two turtledoves or two young pigeons, then he shall bring as his offering for that in which he has sinned, one tenth of an ephah of fine flour for a sin offering. He shall put no oil on it, and he shall not put any frankincense on it, for it is a sin offering.

Note 1 ephah is about 22 liters or about 2/3 of a bushel

WEB · World English Bible
But if his means suffice not for two turtle-doves, or two young pigeons, then he shall bring his oblation for that wherein he hath sinned, the tenth part of an ephah of fine flour for a sin-offering: he shall put no oil upon it, neither shall he put any frankincense thereon; for it is a sin-offering.
ASV · American Standard Version

Related passages

From the Treasury of Scripture Knowledge, grouped by the word they explain.

But if
Leviticus 5:7
the tenth part
Exodus 16:18, 36
fine flour
Leviticus 2:1; Numbers 7:13, 19–89; Numbers 15:4–9
no oil
Leviticus 2:1, 2, 4, 5, 15, 16; Numbers 5:15; Psalm 22:1–21; Psalm 69:1–21; Isaiah 53:2–10
for it is
Leviticus 5:6, 9, 12; 2 Corinthians 5:21