《新唐书·列传·卷四十八》
臣计算天下在编户口，贫弱者多。有卖房子押田地以交纳劳役的。
臣计天下编户，贫弱者众，有卖舍、帖田供王役者。
I estimate that there are many poor people among the registered households in the world. Some people sold houses and mortgaged their land to do labor service.