וַיִּקְרָ֣א יְהוֹשֻׁ֗עַ אֶל־שְׁנֵ֤ים הֶֽעָשָׂר֙ אִ֔ישׁ אֲשֶׁ֥ר הֵכִ֖ין מִבְּנֵ֣י יִשְׂרָאֵ֑ל אִישׁ־אֶחָ֥ד אִישׁ־אֶחָ֖ד מִשָּֽׁבֶט׃
Then Joshua called the twelve men, whom he had prepared of the children of Israel, out of every tribe a man;
Read halakhic rulings (Jewish law) on Joshua 4:4: and classical halakhic sources.