Parashas Bamidbar · Side page (no TT primary unit)
מִבֶּ֨ן עֶשְׂרִ֤ים שָׁנָה֙ וָמַ֔עְלָה כׇּל־יֹצֵ֥א צָבָ֖א בְּיִשְׂרָאֵ֑ל תִּפְקְד֥וּ אֹתָ֛ם לְצִבְאֹתָ֖ם אַתָּ֥ה וְאַהֲרֹֽן׃
You and Aaron shall record them by their groups, from the age of twenty years up, all those in Israel who are able to bear arms.
Bamidbar Rabbah / classic — EXTRA.
מבן עשרים שנה —\ldots לגיונות של מלך.
English: “From twenty years old” — \ldots the legions of the King.
Custom
Chazal treat the age of twenty as the threshold for service in the divine hosts.