When Duke Liang stayed leisurely at home, a red bird carried a golden bamboo scroll with purple decorative patterns in its beak to his court. Didn't know what it is, he sent someone to consult Confucius. Confucius watched carefully and said, "It is the Lingbao prescription that emperor Yu once carried. He put it in the stone casket and hid it in the mountain before his death. Now it is carried by a red bird to the duke. It must be bestowed by the heaven!"