Moses
Numbers 2:3BSB·traditional attribution

On the east side, toward the sunrise, the divisions of Judah are to camp under their standard: The leader of the Judahites is Nahshon son of Amminadab,

Matthew Henry Presbyterian @wholebiblehenry

We have here the particular distribution of the twelve tribes into four squadrons, three tribes in a squadron, one of which was to lead the other two. Observe, 1. God himself appointed them their place, to prevent strife and envy among them.

Commenting on Numbers 2:3-34

John Gill Reformed Baptist @doctorgill

And on the east side, towards the rising of the sun,.... Which rises in the east; or of all; for, as Jarchi observes, that which is "before" is called "Kedem", the east, as the west is called "behind": shall they of the standard of the camp of Judah pitch, throughout their armies; the tribes of Judah, Issachar, and Zebulun, formed one camp, which had its...

Jamieson-Fausset-Brown Reformed @jfbcommentary

on the east side toward the rising of the sun shall they of the standard of the camp of Judah pitch throughout their armies--Judah, placed at the head of a camp composed of three tribes rallying under its standard, was said to have combined the united colors in the high priest's breastplate, but called by the name of Judah.