Rashi on Leviticus 23:16/רש"י על ויקרא כ״ג:ט״ז

1השבת השביעת — Translate this as the Targum does שבועתא שביעתא THE SEVENTH WEEK.

2עד ממחרת השבת השביעת תספרו EVEN UNTIL THE MORROW AFTER THE SEVENTH WEEK SHALL YE NUMBER — until, but not including the day until which you count: thus there are 49 days (the seven complete weeks spoken of in the preceding verse).

3'חמשים יום והקרבתם מנחה חדשה לה‎… FIFTY DAYS — AND YE SHALL OFFER A NEW OBLATION UNTO THE LORD — i. e. on the fiftieth day ye shall offer it. This, I say, is a Midrashic explanation, but the literal sense is: “Even unto the morrow of the seventh week which is the fiftieth day shall ye number”: the text has its phrases inverted.

4מנחה חדשה A NEW MEAL OFFERING — It was the first meal-offering that was offered from the new crop. And if you ask, “But surely the meal-offering of the Omer has already been offered on the 16th of Nisan”?! Then I reply: It (the Omer) was not like all the other meal-offerings — which, with one exception (cf. Numbers 5:15), were all brought of wheat — since it was brought of barley and therefore it is not taken into account (cf. Menachot 84b).