《明史·列传·卷二百一十六》
因此皇帝给也先颁敕书说 ：以前派使者到你那儿，因小人说长道短，致使双方失去和气，发动了战争。
因敕也先曰： 前者使往，小人言语短长，遂致失好。
Therefore the emperor issued a decree to Also First saying: we used to send envoys, but since the villains said bad things and started rumors, it caused both sides to lose harmony and start a war.