Numbers 1:20Meaning & Commentary from the Church Fathers

Of Ruben the eldest son of Israel, by their generations and families and houses and names of every head, all that were of the male sex, from twenty years old and upward, that were able to go forth to war,

וַיִּהְי֤וּ בְנֵֽי־רְאוּבֵן֙ בְּכֹ֣ר יִשְׂרָאֵ֔ל תּוֹלְדֹתָ֥ם לְמִשְׁפְּחֹתָ֖ם לְבֵ֣ית אֲבֹתָ֑ם בְּמִסְפַּ֤ר שֵׁמוֹת֙ לְגֻלְגְּלֹתָ֔ם כָּל־זָכָ֗ר מִבֶּ֨ן עֶשְׂרִ֤ים שָׁנָה֙ וָמַ֔עְלָה כֹּ֖ל יֹצֵ֥א צָבָֽא׃