Arminian
Wesley: seek—when this judgment is executed, if you pursue this prophecy, you will find, that all things exactly come to pass, as I have told you. His—my spirit, (such sudden changes of persons being frequent here) hath brought all these creatures together, as he formerly brought the creatures to Adam, and to Noah, by an instinct which he put into them.
“Search the book of the LORD and read”: the prophecy invites checking. Wesley says anyone who compares it with the event will find that everything came to pass.
Reformed
Calvin: inquire at the book of Jehovah. By the book of the Lord some understand this prophecy, as if he had enjoined them to read attentively this prediction; for not even in the minutest point will it fail at the appointed time. Others explain it more ingeniously as denoting the eternal decree of God. I willingly interpret it as denoting the Law itself, which by way of eminence is called the book of the Lord; for from the Law, as from its source, the Prophets drew their doctrine, as we have frequently remarked. Lest the strangeness of the event should prevent the prediction from being believed, Isaiah says that the Jews had been warned of it long before; and thus he indirectly censures the unbelief of those who stared at the announcement, as if it had been something uncommon. He appropriately brings them back to the Law, in which God frequently declares that he will take care of his people, and that he will punish the wicked and reprobate. Moses having long ago spoken in this manner, the Prophet says that there is no reason why it should be difficult to believe what he foretells, since he brings forward nothing new, but only confirms now what Moses declared and testified. Not one of those; that is, of the animals. For his mouth hath commanded: although the works of God are sufficiently plain, yet by his mouth, that is, by the word, he makes them plainer to us. And this is the true contemplation of the works of God, when we keep our eye fixed on the mirror of the word. And his Spirit hath gathered them: he alludes elegantly to the breath, from which the words proceed; this prediction is abundantly powerful, because the God who by his voice commanded the brute animals to possess the land of Edom will bring them by merely breathing. We ought not to wonder that the slightest expression of the will of God causes all the animals to assemble, as happened at the flood, and likewise at the very creation of the world, when all the animals were gathered together, by the command of God, to the first man.
The book is still the Law, Moses already having said God would avenge his people. The gathered mates stay with Edom’s creatures by that command.”