Commentary for Hosea 10:2

Their heart has parted from Me.

now they shall be desolate. That is the thing that shall demolish (וְעָרְפוּ) thier altars, i.e., it will destroy them. This is an expression similar to (Deut. 21:4) “and they shall dehead (יַעֲרֹף)”; (Ex. 13:13) “and you shall behead it (וְעֲרַפְתּוֹ).” He will break their neck. Another explanation according to Midrash Aggadah: Peace is great, for, even if Israel worships idols, but there is peace among them, Satan does not bring charges against them, as it is said: (above 4:17) “Ephraim is joined: although he worships idols, let him alone.” Strife, however, is hated, as it is said: “Their heart has parted; now they will be guilty.” Satan can open his mouth to bring charges. [from unknown Midrashic source]