וַיִּרְא֥וּ אַנְשֵֽׁי־אַשְׁדּ֖וֹד כִּֽי־כֵ֑ן וְאָמְר֗וּ לֹֽא־יֵשֵׁ֞ב אֲר֨וֹן אֱלֹהֵ֤י יִשְׂרָאֵל֙ עִמָּ֔נוּ כִּֽי־קָשְׁתָ֤ה יָדוֹ֙ עָלֵ֔ינוּ וְעַ֖ל דָּג֥וֹן אֱלֹהֵֽינוּ׃
E os homens de Ashdod viram o que aconteceu e disseram: "Que a Arca do Elohim de Yisra'el não fique conosco, pois Sua mão está pesada sobre nós e sobre Dagom, nosso deus."
Megillat Ta'anit
This is what is written “And David conquered the stronghold of Zion which is the city of David.” (Shmuel I 5:7) this is the place of the karaites (?) right now. Since they were troubling the people of Jerusalem and they were unable to go out or in except at night, they declared the day they were driven out as a holiday.