Commentary for Rosh Hashanah 7:12

ולרגלים: רגלים באחד בניסן הוא בחמשה עשר בניסן הוא אמר רב חסדא רגל שבו ראש השנה לרגלים

But perhaps at first he simply had not decided on the limit? The truth is that the best explanation is that which was given first.

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