Midrash for Joshua 4:12
וַ֠יַּעַבְרוּ בְּנֵי־רְאוּבֵ֨ן וּבְנֵי־גָ֜ד וַחֲצִ֨י שֵׁ֤בֶט הַֽמְנַשֶּׁה֙ חֲמֻשִׁ֔ים לִפְנֵ֖י בְּנֵ֣י יִשְׂרָאֵ֑ל כַּאֲשֶׁ֛ר דִּבֶּ֥ר אֲלֵיהֶ֖ם מֹשֶֽׁה׃
And the children of Reuben, and the children of Gad, and the half-tribe of Manasseh, passed on armed before the children of Israel, as Moses spoke unto them;
Mekhilta d'Rabbi Yishmael
(Ibid.) "And chamushim did the children of Israel go up from the land of Egypt": "chamushim" indicates "armed," as in (Joshua 1:14) "Then you shall cross over chamushim" (in context, "armed"), and (Ibid. 4:12) "And the children of Reuven and the children of Gad and half the tribe of Menasheh crossed over chamushim … (13) forty thousand armed men, etc."
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