Seem that the commandment is to count, why do we make a distinction between counting during the day and at night?
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The Torah commands us to count the Omer "מהחל חרמש בקמה" (Devarim 16:9), ("When the sickle 'begins' with the stalks"). Thus, it is assumed that the Omer should be counted when the stalks for the Korban Omer should be cropped. The mitzva of קצירת העומר (cropping of the omer) applies at night (Menachos 71a), and it is disputed amongst the Rishonim whether it is acceptable if done by day. Thus, the Shulchan Aruch rules (following the Rosh) that if one forgot at night, he should count by day, but without a b'racha. (See Tur OC, 489.) |
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The cutting of the Omer was done at night, and therefore the counting of the Omer is done with a Bracha only at night. (Tosafos HaRosh, Megilla 20b) |
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I heard a shiur last week where it was related to the word תמימות/complete (in שבע שבתות תמימות תהיינה/they should be seven complete weeks). A halakhic day begins at night, so in order for it to be counted "completely," the counting needs to be done at night. According to R' Soloveitchik, when you "make up" a missed night by counting during the day, you aren't actually fulfilling the mitzva; rather, you are just enabling yourself to count with a bracha on subsequent nights. "Counting" can only be done if you count consecutively, so if you count 1 and skip 2, you can't then count 3. By counting 2 during the day, you've maintained the continuity so that you can still count 3. |
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