Related for Megillah 37:13
ומאן דאמר מאיש יהודי תוקפו של מרדכי ומ"ד מאחר הדברים האלה תוקפו של המן ומ"ד מבלילה ההוא תוקפו של נס
he who says from “There was a Jew,” he power of Mordecai; he who says from “After these things” the power of Haman; and he who says, from “On that night” the power of the miracle.
Tosefta Megillah
The obligation of the Megillah [is to read it] from the beginning until the end, the words of Rabbi Meir. Rabbi Yehuda says, from [the words] "A Jewish man" (Esther 2:5). Rabbi Yosei says, from [the words], "After these events" (Esther 3:1). Rabbi Shimon ben Elazar, from "That night" (Esther 6:1). But all agree that [regardless of the point at which one started], the obligation is to complete [the Megillah] until the very end.
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