Reference for Moed Katan 15:3

ואי כתב רחמנא וצוה הכהן הוה אמינא הני אין דלאו טומאה דגופיה אבל טומאה דגופיה אימא מיחזא חזיא ליה צריכא

Again, had the All Merciful prescribed only 'And the priest shall command that they empty the house. , I might have said that [postponement is granted] in the case of these effects [of the house] because the uncleanness is not that of a person, but where the uncleanness is that of a person I might say that the priest should inspect him, [without delay]: therefore it is necessary [to have both texts]. The Master said: 'There is a day when you do see it in him and there is a day when you do not see it in him.

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