The Torah singles out Har Sinai regarding Shmeita and no other mitzvah to show that the this mitzvah isn’t like any other. You see the the reward much more easily.

Pirkei Avos - Elisha Ben Avuya & Pesach Sheini

Short Divrei Torah Liluy Nishmas my dear brother, R’ Avraham Ben Yaakov Levi z”l.

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