Talmud for Megillah 7:7
פורים איצטריכא ליה מהו דתימא נגזור משום דרבה קמ"ל
It was necessary to state the rule [separately] in the case of Purim. For you might suggest that we should forbid this because of the prohibition of Rabbah. We are therefore told that this is not so.
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