The odd ones out[1]
אלה יעמדו לברך את-העם על-הר גרזים בעברכם את-הירדן שמעון ולוי ויהודה ויששכר ויוסף ובנימן: ואלה יעמדו על-הקללה בהר עיבל ראובן גד ואשר וזבלן דן ונפתלי
These shall stand on Mount Gerizim to bless the people, as you pass over the Jordan River: Shimon, Levi, Yehudah, Yissachar, Yosef, and Binyamin. And these shall stand on Mount Eival for the curse: Reuven, Gad, Asher, Zevulun, Dan, and Naftali[2]
One of the commandments[3] the Jewish people were instructed to fulfill as they entered the land of Israel is known as the Blessings and the Curses. The twelve tribes were to divide in two; half would pronounce blessings to the people for those that keep the Torah, and half would pronounce curses for those that didn’t. The Torah tells us who is to stand where: Shimon, Levi, Yehudah, Yissachar, Yosef, and Binyamin are to stand on Mount Gerizim and pronounce the blessings. If we look closely, we’ll see that they’re all children of Rochel and Leah, Yaakov’s primary wives. Those to stand on Mount Eival and pronounce the curses were Reuven, Gad, Asher, Zevulun, Dan, and Naftali. The four children of Bilhah and Zilpah, Yaakov’s other two wives, are in this list. However, Reuven and Zevulun are the children of Leah. Why are they singled out from their brothers on Mount Gereizim, and told to stand on Mount Eival?