Reference for Moed Katan 15:2

ורבי אמר אצטריך דאי כתב רחמנא וביום הראות בו הוה אמינא לדבר מצוה אין לדבר הרשות לא כתב רחמנא וצוה הכהן

For had the All Merciful prescribed [only], 'And on a day when [raw flesh] shall be seen in him.' I might have said that postponement [of inspection or pronouncement on the findings] is granted only for the [due observance of a] religious obligation, but not for the sake of an optional [matter]; therefore did the All Merciful prescribe also, 'And the priest shall command'.

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