《史记·十二本纪·周本纪》
而这时天下尚未统一，众公卿们都很害怕，进行 穆卜 ；周公因而祓除斋戒，自愿作替身，想代替武王承受灾疾，武王的病渐渐有了好转。
天下未集，群公惧，穆卜，周公乃祓斋，自为质，欲代武王，武王有瘳。
At that time, the world had not yet been unified. The dukes and ministers were all very afraid, and they performed the Mu divination. As a result, Duke Zhou exorcised evil spirits and fasted. He volunteered to be a substitute, wanting to suffer the calamity in King Wu's place. King Wu's illness gradually improved.