When they return to it, they will remove all its detestable things and all its abominations.
Here he adds something more important — that when the Israelites had returned to their country they would be sincere worshippers of God, and not only offer sacrifices in the temple, but purge the land of all its pollutions. Here also the Prophet admonishes them how great and detestable was the impiety of the ten tribes, because they had contaminated the land with idols.
Prophecy was designed to exalt every valley as well as to bring low every mountain and hill (Isa 40:4), and prophets were to speak not only conviction to the presumptuous and secure, but comfort to the despised and desponding that trembled at God's word.
Commenting on Ezekiel 11:14-21
And they shall come thither,.... That those of the captivity shall come to the land of Israel, they or their posterity: and they shall take away all the detestable things thereof; the idols of the nations, that had been there introduced, detestable to God and all good men: and all the abominations thereof from thence; idols, as before, even all of them, so that idolatry...