C. F. Keil and Franz Delitzsch on 2 Kings 19:4

2Ki 19:4

Perhaps Jehovah thy God will hear the blasphemies of the living God on the part of Rabshakeh. ישׁמע: hear, equivalent to observes, take notice of, and in this case punish. חי אלהים: the living God, in contrast to the gods of the heathen, who are only lifeless idols (cf. 1Sa 17:26, 1Sa 17:36). והוכיח is not to be taken in connection with לחרף, as if it stood for להוכיח, “and to scold with words” (Luth., Ges., etc.), but is a perf. rel. or a progressive perfect (Ewald, §234, a.), and the continuation of ישׁמע: “and will chastise (punish, sc. him) for the words which He has heard.” תף ונשׂאת “therefore lift up prayer (to heaven) for the (still) existing remnant, sc. of the people of God;” nearly all Judah having come into the power of Sennacherib since the carrying away of the ten tribes.