וְנָשִׂ֥יא אֶחָ֛ד נָשִׂ֥יא אֶחָ֖ד מִמַּטֶּ֑ה תִּקְח֖וּ לִנְחֹ֥ל אֶת־הָאָֽרֶץ׃
E um príncipe, um príncipe por tribo tomareis para distribuir a terra como herança.
Or HaChaim
למטה יהודה, for the tribe of Yehudah. We need to explore why the leaders of the tribes of Yehudah, Shimon, and Benjamin are not given the title נשיא in our paragraph. Perhaps the reason is connected to the fact that the names of these three tribes appear quite close to the words ונשיא אחד נשיא אחד in verse 18 so that the Torah saw no need to repeat the word נשיא again. Starting with verse 22 the names of the tribes are so far removed from verse 18 that the Torah saw fit to add the title נשיא when mentioning the leader of the respective tribes.