וַיָּבֹ֗אוּ מִן־בְּנֵ֤י בִנְיָמִן֙ וִֽיהוּדָ֔ה עַד־לַמְצָ֖ד לְדָוִֽיד׃
And there came of the children of Benjamin and Judah to the stronghold unto David.
Read kabbalistic (mystical) interpretation of I Chronicles 12:17: and classical mystical sources.