Judges 1:3

Unto Simeon his brother. — Both Judah and Simeon were sons of Leah. It was natural that the two tribes should help one another, because their lots were conterminous; indeed, the lot of the Simeonites is said to lie “within the inheritance of the children of Judah” (Joshua 19:1), and was given them “out of the portion of the children of Judah” (ib., Judges 1:9), because a larger territory had been assigned to the tribe of Judah than it required. The tribe of Simeon was remarkable for its fierce valour (1 Chronicles 4:24), of which we find a trace even in Judith, who belonged to that tribe (Jdt. 9:2). It would, however, have been helpless without the assistance of Judah; for we see from a comparison of the first with the second census in the Desert that Simeon had decreased in strength from 59,300 to 22,200. This fearful diminution seems to have been due to the plague, which may have fallen most heavily on them from their greater guilt, as we may infer from the shamelessness of their prince Zimri (Numbers 25:14; Numbers 1:23; Numbers 26:14). Hence the tribe is omitted in the blessing of Moses (Deuteronomy 33). They seem to have melted away among the nomad tribes of the south, but we see them showing a last flash of vitality in the days of Hezekiah (1 Chronicles 4:41).

Into my lot — i.e., into the territory assigned me by lot (“Croesus devasted the lots (klerous) of the Syrians” (Herod. i. 76). The lots of Judah and Simeon fell within two lines drawn to the Mediterranean from the northern and southern extremities of the Dead Sea (Joshua 15).