《旧唐书·列传·卷一百二十六》
至于我从诸藩王家中选取洒扫庭院的宫女备用，不是出于扩充歌舞艺妓的考虑；而是体恤尚在童年的同宗女儿，确实没有征召嫔妃的疑惑。
至于备洒扫于诸王，非自广其声妓也；恤髫龀之宗女，固无嫌于征取也。
As for my selection of palace maids from the households of the vassal kings, it is not for the purpose of expanding the number of singing and dancing entertainers; rather, it is to show compassion for the young daughters of the imperial clan, and there is indeed no doubt about them being recruited as concubines.