Rashi on Isaiah
shall come with a strong [hand] to mete out retribution upon the heathens. ([Mss. read:] Upon the nations.)
Ibn Ezra on Isaiah
בחזק With strong hand, יד hand is to be supplied; as to the use of יד as a masculine noun, comp. Ez. 2:9.24חזק is an adjective; the noun, which is to be qualified by this attribute, must be supplied.
Rashi on Isaiah
behold His reward is with Him It is prepared with Him for the righteous.