續一切經音義 9.172

9.172

怨讎（上於袁反玉篇云枉也下市流反切韻怨也禮記云父之讎弗與共戴天也鄭注云父者子之天也殺已之天與共戴天非孝子也）。

怨讎 (The first character has the fanqie 於袁 [yuān]. The Yupian states: 'Crooked; wronged.' The second character has the fanqie 市流 [chóu]. The Qieyun states: 'Enmity.' The Liji states: 'With the slayer of one's father, one does not live under the same sky.' Zheng's commentary states: 'The father is the son's sky; if one lives under the same sky with the slayer of one's own sky, one is not a filial son.').