פּירוש אויף במדבר 33:49

“They encamped by the Jordan from Beth-jeshimoth as far as Abel-shittim in the plains of Moab” [33:49]. Israel rested by the Jordan from the city of Beth-jeshimoth to Shittim, in the plains of Moab. From here we learn how wide and long [the area] was where Israel rested at one time and in one place. Rabah bar bar Hanah said: I was at that place and I saw that where Israel rested was twelve miles long. The people of Israel was so numerous that they needed a place that was twelve miles wide.⁹Rashi, Numbers, 33:49.

מבית הישמת עד אבל השטים [AND THEY ENCAMPED] … FROM BETH-JESIMOTH EVEN UNTO ADEL-SHITTIM — Here it tells you that the extent of Israel’s camp was twelve miles, for Rabba bar bar Chana said: “I myself have seen that place etc., and it is three Parsangs (12 miles) square” (Eruvin 55b).

ויחנו על הירדן...בערבות מואב. There, וידבר ה' אל משה בערבות מואב על ירדן יריחו

אבל השטים — The plain of Shittim had the name אבל (cf. Rashi on Genesis 14:6).