Joshua 17:17 Midrash

וַיֹּ֤אמֶר יְהוֹשֻׁ֙עַ֙ אֶל־בֵּ֣ית יוֹסֵ֔ף לְאֶפְרַ֥יִם וְלִמְנַשֶּׁ֖ה לֵאמֹ֑ר עַם־רַ֣ב אַתָּ֗ה וְכֹ֤חַ גָּדוֹל֙ לָ֔ךְ לֹֽא־יִהְיֶ֥ה לְךָ֖ גּוֹרָ֥ל אֶחָֽד׃

And Joshua spoke unto the house of Joseph, even to Ephraim and to Manasseh, saying: ‘Thou art a great people, and hast great power; thou shalt not have one lot only;

Read midrashic interpretation of Joshua 17:17: and classical rabbinic exegesis.