Joshua
Joshua 15:4ESV·traditional attribution

passes along to Azmon, goes out by the Brook of Egypt, and comes to its end at the sea. This shall be your south boundary.

Matthew Henry Presbyterian @wholebiblehenry

Judah and Joseph were the two sons of Jacob on whom Reuben's forfeited birth-right devolved. Judah had the dominion entailed on him, and Joseph the double portion, and therefore these two tribes were first seated, Judah in the southern part of the land of Canaan and Joseph in the northern part, and on them the other seven did attend, and had their respective lots as...

Commenting on Joshua 15:1-12

John Gill Reformed Baptist @doctorgill

From thence it passed towards Azmon, and went out unto the river of Egypt,.... In like manner is this coast described, Num 34:5; it is called by Jerom (x) Asemona, and said to be a city in the desert, to the south of Judah, dividing Egypt, and the lot of the tribe of Judah, leading to the sea: and the outgoings of that coast were...

Adam Clarke Methodist @methodicalclarke

Toward Azmon - This was the last city they possessed toward Egypt. The river of Egypt - The most eastern branch of the river Nile. See on Jos 13:3 (note). But there is much reason to doubt whether any branch of the Nile be meant, and whether the promised land extended to that river. On this subject it is impossible to decide either way.