《资治通鉴·晋纪·晋纪十一》
王贡当初把脚横在马上，听了陶侃的话，面容变严肃，把脚放下来，陶侃知道可以使他动心，就又派遣使者告谕他，并割下头发做为信物，王贡于是向陶侃投降。
贡初横脚马上，闻侃言，敛容下脚。侃知可动，复遣使谕之，截发为信，贡遂降于侃。
Wang Gong had originally put his feet across the horse. After hearing Tao Kan's words, his face became serious and he put his feet down. Tao Kan knew that he could move his heart, so he sent another envoy to inform him and cut off his hair as a token of trust. Wang Gong then surrendered to Tao Kan.