Moses
Numbers 2:3ESV·traditional attribution

Those to camp on the east side toward the sunrise shall be of the standard of the camp of Judah by their companies, the chief of the people of Judah being Nahshon the 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.