《史记·三十世家·卫康叔世家》
孔氏的家臣栾宁盘问他们姓名，他们自称是姻戚家的侍妾，于是顺利地进入孔氏家，直抵伯姬住所。
孔氏之老栾宁问之，称姻妾以告。遂入，适伯姬氏。
Kong's retainer, Luan Ning, asked them their names. They said they were concubines of a noble family, and so they were able to enter the Kong family's house and go straight to Bo Ji's residence.