《逸周书·卷四·大聚解》
就召来冶官，把周公之言冶铸在铜版上，放入府中供每月朔日省视。
乃召昆吾冶而铭之，藏府而朔之。
Then he called the smelter and smelted the words of the Duke of Zhou on a copper plate, which was placed in the palace for inspection on the first day of each month.