Midrash for Joshua 19:47
וַיֵּצֵ֥א גְבוּל־בְּנֵי־דָ֖ן מֵהֶ֑ם וַיַּעֲל֣וּ בְנֵֽי־דָ֠ן וַיִּלָּחֲמ֨וּ עִם־לֶ֜שֶׁם וַיִּלְכְּד֥וּ אוֹתָ֣הּ ׀ וַיַּכּ֧וּ אוֹתָ֣הּ לְפִי־חֶ֗רֶב וַיִּֽרְשׁ֤וּ אוֹתָהּ֙ וַיֵּ֣שְׁבוּ בָ֔הּ וַיִּקְרְא֤וּ לְלֶ֙שֶׁם֙ דָּ֔ן כְּשֵׁ֖ם דָּ֥ן אֲבִיהֶֽם׃
And the border of the children of Dan was too strait for them; so the children of Dan went up and fought against Leshem, and took it, and smote it with the edge of the sword, and possessed it, and dwelt therein, and called Leshem, Dan, after the name of Dan their father.
Sifrei Devarim
"he shall leap forth from the Bashan": Just as "leaping forth" (zinuk) connotes leaving one place and being divided into two, so the tribe of Dan took its portion in two places, viz. (Joshua 19:47) "And the boundary of the children of Dan went forth from them, and the sons of Dan went up and they battled, etc."
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