4:21a Now, therefore, issue an order for these men to stop,

Now, give (plur.) the order for those men to stop/cease.
-or-
Therefore, you must order/tell these people to stop rebuilding ⌊Jerusalem city⌋.

4:21b so that this city will not be rebuilt until I so order.

The city of Jerusalem will not be rebuilt until I say so. (New Century Version)
-or-
They must not rebuild the city until/unless I ⌊change my mind/decision and⌋ order/command them to do so.

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