Numbers 2:2-3

2:2 “Every one of the Israelites must camp under his standard with the emblems of his family; they must camp at some distance around the tent of meeting.

The Tribes on the East

2:3 “Now those who will be camping on the east, toward the sunrise, are the divisions of the camp of Judah under their standard. The leader of the people of Judah is Nahshon son of Amminadab.