Rashi on Isaiah
A breaking reed he shall not break Jonathan paraphrases: The meek, who are like a breaking reed, shall not break, and the poor, who are like a flickering candle, shall not be quenched.
Ibn Ezra on Isaiah
A bruised reed. This is a prolepsis, like And stripped the naked of their clothing (Job 22:6). He will not break a reed, is figuratively said for he will not act by violence.
Rashi on Isaiah
and a flickering flaxen wick A wet flaxen wick, that is nearly extinguished. Their king will not rob the poor and will not break the poor and the weak.