《睡虎地秦墓竹简·秦律十八种·仓律》
城旦筑墙和作其它与筑墙相当的劳作，早饭半斗，晚饭三分之一斗，站岗和作其它事的，早晚饭各三分之一斗。
城旦之垣及它事而勞與垣等者，旦半夕參；其守署及為它事者，參食之。
Half a peck of grain for breakfast and one-third of a peck for dinner goes to the people constructing ramparts and doing other work on a par with the construction of city walls, and one-third of a peck of grain each for breakfast and dinner goes to those who stand guard and perform other tasks. 