《明史·列传·卷三十四》
恰逢知院失乃干打算投降，皇上命王友率士卒先行，并谕示他遇到敌人要伺机剿灭。
会知院失乃干欲降，帝令友将士卒先行，谕以遇敌相机剿灭。
When Zhiyuan’s Shi Naigan planned to surrender, the emperor ordered Wang You to lead the soldiers first, and instructed him to take the opportunity to annihilate the enemy when encountered.