《北史·列传·卷六十》
您只要派一个明于智略又平素为诸将所信服的心腹之人，迅速赶到韦帅大军的驻地，观察一下真假虚实。
公但以一腹心，明于智略，素为诸将所信伏者，速至军所，观其情伪。
Just send a trusted confidant who is excellent in tactics and is normally trusted by all generals to Wei Shuai's army to observe the truth and falsehood.