Judg 21:1

וְאִ֣ישׁ יִשְׂרָאֵ֔ל נִשְׁבַּ֥ע בַּמִּצְפָּ֖ה לֵאמֹ֑ר אִ֣ישׁ מִמֶּ֔נּוּ לֹא־יִתֵּ֥ן בִּתּ֛וֹ לְבִנְיָמִ֖ן לְאִשָּֽׁה׃

Now the men of Israel had sworn an oath at Mizpah, saying, “Not one of us will give his daughter in marriage to a Benjamite.”