法苑珠林 70.77

70.77

魏黃初中有鷹生燕巢中。口爪俱赤。至青龍中。明帝為陵霄闕。始搆有鵲巢其上。帝以問高堂隆。對曰。詩云。惟鵲有巢。惟鳩居之。此宮室未成。身不得居之象也（右十二驗出搜神異記）。

During the Huangchu era of the Wei dynasty, a hawk was born in a swallow's nest, with both its beak and talons being red. In the Qinglong era, Emperor Ming built the Lingxiao Gate; just as it was being constructed, a magpie built a nest upon it. The emperor asked Gaotang Long about it, who replied: 'The Book of Songs says, "The magpie has a nest; the dove occupies it." This is an image indicating that before the palace is completed, one will not be able to dwell in it oneself.' (The twelve verifications above are taken from the Soushen yiji.)