Commentaries:
Jamieson, Fausset, and Brown
The repetition is in order that the people about to live without the temple might have, instead, the knowledge of the temple mysteries, thus preparing them for a future restoration of the covenant. So perverse were they that they would say, "Ezekiel fancies he saw what has no existence." He, therefore, repeats it over and over again.
Other Jamieson, Fausset, and Brown entries containing Ezekiel 10:21:
Exodus 25:18
Ezekiel 1:5
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