10:17 and by the first day of the first month they had dealt with all the men who had married foreign women.

By the first day of the first month ⌊of the Jewish year⌋, they had finished with all the men who had married women who were not Jews.
-or-
They finished treating/deciding all the cases of the men who had taken pagan women as their wives on day one of Nisan, the first month ⌊of the year/calendar⌋.

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