And they shall come thither, and they shall take away all the detestable things thereof and all the abominations thereof from thence.

Wesley's Notes

11:18 They - They who assemble upon Cyrus's proclamation first, and then upon Darius's proclamation, shall overcome all difficulties, dispatch the journey, and come safely to their own land. Take away - They shall abolish superstition and idolatry from the temple.

Jamieson-Fausset-Brown Bible Commentary

18. They have eschewed every vestige of idolatry ever since their return from Babylon. But still the Shekinah glory had departed, the ark was not restored, nor was the second temple strictly inhabited by God until He came who made it more glorious than the first temple (Hag 2:9); even then His stay was short, and ended in His being rejected; so that the full realization of the promise must still be future.

Matthew Henry's Concise Commentary

11:14-21 The pious captives in Babylon were insulted by the Jews who continued in Jerusalem; but God made gracious promises to them. It is promised, that God will give them one heart; a heart firmly fixed for God, and not wavering. All who are made holy have a new spirit, a new temper and dispositions; they act from new principles, walk by new rules, and aim at new ends. A new name, or a new face, will not serve without a new spirit. If any man be in Christ, he is a new creature. The carnal heart, like a stone, cannot be made to feel. Men live among the dead and dying, and are neither concerned nor humbled. He will make their hearts tender and fit to receive impressions: this is God's work, it is his gift by promise; and a wonderful and happy change is wrought by it, from death to life. Their practices shall be agreeable to those principles. These two must and will go together. When the sinner feels his need of these blessings, let him present the promises as prayers in the name of Christ, they will be performed.