Reference for Megillah 43:15
ות"ק מ"ש שיורי דלא משום יוצאין אתחולי נמי גזירה משום הנכנסין אמרי מאן דעייל שיולי שייל
But now with regard to the First Tanna: Why does he forbid leaving [less than three verses]? Because of people going out of synagogue. But at the beginning also he should take decree on account of people coming in? I can say that a person coming in asks [how much has been read].
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