《资治通鉴·唐纪·唐纪二十六》
尚书左丞张说从东都洛阳派人给唐玄宗送来了一把佩刀，意思是请玄宗及早决断，铲除太平公主的势力。
左丞张说自东都遣人遗上佩刀，意欲上断割。
Zhang Shuo, the left minister of the Secretariat of the Imperial Court, sent someone to deliver a sword to Emperor Xuanzong of Tang from the Eastern Capital Luoyang, meaning asking Emperor Xuanzong to make a decision quickly and eliminate Princess Taiping's power.