Commentary for I Chronicles 6:45

וּמִמַּטֵּ֣ה בִנְיָמִ֗ן אֶת־גֶּ֤בַע וְאֶת־מִגְרָשֶׁ֙יהָ֙ וְאֶת־עָלֶ֣מֶת וְאֶת־מִגְרָשֶׁ֔יהָ וְאֶת־עֲנָת֖וֹת וְאֶת־מִגְרָשֶׁ֑יהָ כָּל־עָרֵיהֶ֛ם שְׁלֹשׁ־עֶשְׂרֵ֥ה עִ֖יר בְּמִשְׁפְּחוֹתֵיהֶֽם׃ (ס)

and out of the tribe of Benjamin: Geba with the open land about it, and Alemeth with the open land about it, and Anathoth with the open land about it. All their cities throughout their families were thirteen cities.

Rashi on I Chronicles