《新唐书·列传·卷五十三》
有父子两人被牵连都判了死罪，齐澣说： 枝条都砍了，树根也就枯死了，怎么可以父子都判死呢？ 
有父子连坐论死者，澣曰： 条落则本枯，奈何俱死？ 
There were a father and a son who were both sentenced to death. Qi Yan said, "Cutting down both branches will kill the roots of the tree. How can both father and son be sentenced to death?"