《魏书·帝纪·卷九》
自从潘充华有孕东宫，希望其生下皇子，然而熊罴无兆。虺牝逐彰。
自潘充华有孕椒宫，冀诞储两，而熊罴无兆，维虺遂彰。
Ever since Pan Chong Hua became pregnant in the eastern palace, I've hoped that she would give birth to a prince, however, there haven't been any signs. The snake spirit has become evident.