Reference for Shevuot 4:9

מַשְׁבִּיעַ אֲנִי עֲלֵיכֶם, כְּשֶׁתֵּדְעוּן לִי עֵדוּת שֶׁתָּבֹאוּ וּתְעִידוּנִי, הֲרֵי אֵלּוּ פְטוּרִים, מִפְּנֵי שֶׁקָּדְמָה שְׁבוּעָה לָעֵדוּת:

"I beswear you that when you know testimony for me you come and testify for me," they are not liable, for (in such an instance) the oath precedes the testimony, [whereas the Torah states (Leviticus 5:1): "…and he hear the voice of a curse (i.e., the oath) and he saw or knew, etc.", the witnessing preceding the oath, and not the oath preceding the witnessing.]

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