Reference for Numbers 17:21

וַיְדַבֵּ֨ר מֹשֶׁ֜ה אֶל־בְּנֵ֣י יִשְׂרָאֵ֗ל וַיִּתְּנ֣וּ אֵלָ֣יו ׀ כָּֽל־נְשִֽׂיאֵיהֶ֡ם מַטֶּה֩ לְנָשִׂ֨יא אֶחָ֜ד מַטֶּ֨ה לְנָשִׂ֤יא אֶחָד֙ לְבֵ֣ית אֲבֹתָ֔ם שְׁנֵ֥ים עָשָׂ֖ר מַטּ֑וֹת וּמַטֵּ֥ה אַהֲרֹ֖ן בְּת֥וֹךְ מַטּוֹתָֽם׃

And Moses spoke unto the children of Israel; and all their princes gave him rods, for each prince one, according to their fathers’houses, even twelve rods; and the rod of Aaron was among their rods.