《资治通鉴·汉纪·汉纪一》
现在刚刚进入秦的都城，就要安享其乐，这即是人们所说的 助桀为虐 了。
今始入秦，即安其乐，此所谓 助桀为虐 。
Now that you have just entered the capital of Qin, you are about to enjoy a peaceful life. This is what people call "assisting the wicked to commit violence".