ציטירנדיקער פּירוש אויף במדבר 34:5

ויעל אברם וגו' הנגבה AND ABRAM WENT UP [OUT OF EGYPT] …TOWARDS THE NEGEB — He went up to proceed to the Southern part of the land of Israel — as it is said above (Genesis 12:9) “going on more and more to the Negeb” — to the Mount Moriah. Still, when one goes from Egypt to the land of Canaan, one proceeds from South to North, because Egypt is to the South of the land of Israel, as may be proved from the account of the journeys that the Israelites made in the wilderness and from the description of the boundaries of the land of Israel (see Numbers 33 and Numbers 34).

From Shichor. This is the Nile River, which is also referred to as the Egyptian brook. It is close to the southwestern border of Eretz Yisroel, as it is said in Parshas, “These are the journeys.”²Bamidbar 34:5. From here we learn that in Yehoshua’s lifetime, he did not conquer the entire southern border except from the wilderness of Tzin, which is synonymous with the bare, divided mountain³See above 11:17. that goes up to Seir; to the Nile. This is the boundry of Gaza mentioned above, “From Kodeish-Barneia to Gaza.⁴See above 10:41.

Was too small to contain. He is referring to Moshe’s [altar], like a person says to his friend, “So and so is a dwarf,” [i.e.,] he is disqualified to perform the service.³⁹See Bamidbar 34:5, 8. There, Targum Yonoson Ben Uziel identifies the “Brook of Egypt” [מצרים נחלה] as the Nile River.