All ye {i} beasts of the field, come to devour, yea, all ye beasts in the forest.

(i) Meaning, the enemies of the Church, as the Babylonians, Assyrians, etc thus he speaks to scare the hypocrites and to assure the faithful that when this comes they may know it was told to them before.

Wesley's Notes

56:9 Come - This is a prediction of Israel's destruction by their cruel enemies. The prophet having largely discoursed concerning the Messiah, and his kingdom, and having encouraged the Gentiles with God's gracious promises made to them, now proceeds to terrify the unbelieving Jews, and to shew that as the Gentiles would believe, and be saved, so they would reject their Messiah, and be destroyed.

Jamieson-Fausset-Brown Bible Commentary

9. beasts-Gentile idolatrous nations hostile to the Jews, summoned by God to chastise them (Jer 12:7-9; 50:17; Eze 34:5): the Chaldeans and subsequently the Romans. The mention of the "outcasts of Israel" (Isa 56:8) brings in view the outcasting, caused by the sins of their rulers (Isa 56:10-12).

to devour-namely, Israel.

Matthew Henry's Concise Commentary

56:9-12 Desolating judgments are called for; and this severe rebuke of the rulers and teachers of the Jewish church, is applicable to other ages and places. It is bad with a people when their shepherds slumber, and are eager after the world. Let us pray the Great Shepherd to send us pastors after his own heart, who will feed us with knowledge, that we may rejoice in his holy name, and that believers may be daily added to the church.