וַיֹּ֣אמֶר יְהוּדָה֩ לְשִׁמְע֨וֹן אָחִ֜יו עֲלֵ֧ה אִתִּ֣י בְגוֹרָלִ֗י וְנִֽלָּחֲמָה֙ בַּֽכְּנַעֲנִ֔י וְהָלַכְתִּ֧י גַם־אֲנִ֛י אִתְּךָ֖ בְּגוֹרָלֶ֑ךָ וַיֵּ֥לֶךְ אִתּ֖וֹ שִׁמְעֽוֹן׃
Alors Juda dit à Siméon, son frère: "Aide-moi à faire la guerre au Cananéen dans mon territoire et à mon tour je ferai campagne avec toi dans le tien." Et Siméon se joignit à lui.
Midrash Aggadah
To Shimon, Shelumiel ben Tzurishaddai. Even though his descendant is Zimri, on whose account 24,000 died in a plague, G-d made peace with him and placed him next to Reuben, who had done repentance (a ba'al t'shuvah). Therefore it is said, "ben tzuri-shaddai," ("Shaddai is my rock")...
Sifrei Devarim
"And to his people shall You bring him": For he (Judah) had drawn him (Shimon) near to himself for inheritance (of the land), as it is written (Judges 1:3) "and Judah said to Shimon his brother: "Go up with me (in battle) for my portion." And sections fell (for inheritance) from the inheritance of the children of Judah to that of the children of Shimon (viz. Joshua 19:9).