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Why does the Torah (תורה) count Jews only from age 20 when armies typically draft younger soldiers? Rabbi Zweig argues that 20 marks the age of communal responsibility, when one becomes obligated to risk one's life for Klal Yisrael's survival. The census counts not soldiers but committed Jews—only those ready to be moser nefesh for Am Yisrael participate in Korbanos Tzibbur and are considered part of the national body.
The shiur opens with a fundamental question from Parshas Ki Sisa: Why does the Torah (תורה) count the Jewish people only from age 20 (ben esrim vama'alah), the age for military service, when historically armies drafted soldiers much younger? The Revolutionary War, Israeli Army, and ancient societies all recruited before age 20, especially given shorter life expectancies. What is unique about the Jewish approach to this threshold? Rabbi Zweig proposes that age 20 marks not military capability but the threshold of communal responsibility. Until 20, a person's primary obligation is self-development. At 20, however, one becomes obligated to be moser nefesh for the community—to literally put one's life on the line for the survival of Klal Yisrael. The Mishna's statement "ben esrim lirdof" supports this: at 20 one enters the world of serious pursuit, including marriage (typically at 18) and earning a living. But the deeper meaning is that 20 is when the Torah obligates a person to risk their life for other Jews.
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Shemos 30:11-16 (Parshas Ki Sisa - machatzis hashekel and census)
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