וְהַחֹנִים֙ קֵ֣דְמָה מִזְרָ֔חָה דֶּ֛גֶל מַחֲנֵ֥ה יְהוּדָ֖ה לְצִבְאֹתָ֑ם וְנָשִׂיא֙ לִבְנֵ֣י יְהוּדָ֔ה נַחְשׁ֖וֹן בֶּן־עַמִּינָדָֽב׃
Now those that pitch on the east side toward the sunrising shall be they of the standard of the camp of Judah, according to their hosts; the prince of the children of Judah being Nahshon the son of Amminadab,
Read halakhic rulings (Jewish law) on Numbers 2:3: and classical halakhic sources.