《睡虎地秦墓竹简·秦律十八种·司空》
公士以下的人以劳役抵偿赎刑、赎死的罪，要服城旦、舂的劳役，但不必穿红色囚服，不施加木械、黑索和胫钳。
公士以下居贖刑罪、死罪者，居於城旦舂，毋赤其衣，勿枸櫝欙杕。
For people ranked as Gongshi or below using labor to pay for their crimes of redemption or capital punishment, they are to perform city dawn and pounding labor, but they do not have to wear red prison uniforms or be put in wooden stocks, black ropes or shin clamps.