《仪礼·有司》
雍府又合执两只俎，将其陈设在羊俎的西边，与前面所陈并排，都是东西陈设；将两只柄上刻有花纹图案的匕顺着放在俎上，匕柄向西。
雍人合执二俎，陈于羊俎西，并皆西缩。覆二疏匕于其上，皆缩俎，西枋。
Yongfu also held two zu and displayed them on the west of the sheep zu, on the same level as the zu displayed before, all displayed from east to west; then two bi with carved patterns on the handles were placed on the zu, with the handles facing west.