不孝有三，无后为大 (不孝有三，無後為大) bù xiào yǒu sān, wúhòu wèi dà

bù xiào yǒu sān, wúhòu wèi dà phrase There are three ways to be unfilial; having no sons is the worst. (citation from Mencius 孟子)
Domain: Literary Chinese 文言文
Notes: (CC-CEDICT '不孝有三，無後為大')