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Post History
We are required to count the omer because the pasuk states וּסְפַרְתֶּם לָכֶם so Mitzvah #127 here mandates that counting. There is also an obligation (#221 on the list) to count the years towar...
#1: Initial revision
Why is this counting not a mitzvah?
We are required to count the omer because the pasuk states וּסְפַרְתֶּם לָכֶם so Mitzvah #127 [here ](https://www.jewfaq.org/613_commandments)mandates that counting. There is also an obligation (#221 on the list) to count the years towards Shmita as it is written וְסָפַרְתָּ֣ לְךָ֗ (pasuk [here](https://www.sefaria.org/Leviticus.25.8?lang=bi&with=all&lang2=en)) But for some reason, when counting towards purity (as a zav) (15:13), the pasuk reads וְסָפַר לוֹ שִׁבְעַת יָמִים לְטָהֳרָתוֹ that injunction does not turn into a listed mitzvah! Why would the other two countings be a mitzvah but this counting, called forth by similar text, is not a mitzvah. Why not?