Tafsiran Yesaya 28:26: Rashi & Ibn Ezra

And He shall chasten him justly Likewise, he whose God directs him, He shall not send prophets forever to admonish him. Since he does not heed admonition, He shall chasten him with judgments of chastening in order that the toil of His admonition will help, like the one who smoothes the surface of the earth to sow, in order that the toil of his plowing that he plowed shall succeed.

ויסרו For the Lord instructed him.³⁴A. V., For his God doth instruct him. The Lord has already instructed him, who sows and scatters the seed, and taught him how to do it.

למשפט According to the custom,³⁵A. V., To discretion. I. E. seems to lay stress on the definite article in לַמּשפט according to the usual well-known custom. to do as it is usually done; comp. כמשפט after the manner (Num. 29:32). His God doth teach him. The same.³⁶The same as ויסרו למשפט. I. E. does not explain the change of the tense in the two verbs; the first (וְיִסְּרוֹ) being past, the second (יוֹרֶנּוּ) future; ויסרו could also be explained to be future by the conversive ו, but I. E. paraphrases it כבר יסר, hath already instructed him.