Reference for Megillah 43:13

פשיטא השתא ומה אתחלתא דקא מקיל תנא קמא מחמירי יש אומרים שיור דמחמיר ת"ק לא כ"ש דמחמירי יש אומרים

This is obvious! Now that in regard to the beginning of a section where the first tanna is lenient the alternative opinion is strict, is it not certain that in regard to the verses left [at the end of the section] where the first tanna is strict the alternative opinion will also be strict.

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