I might think that he could harvest at night and count at night and bring (the omer) at night; it is, therefore, written (Ibid.) "from the day that you bring (the omer)."
What, then, is the procedure? Harvesting, counting at night, and bringing (the omer) in the daytime.
(Devarim 16:10) "And you shall make a festival of weeks (shavuoth) to the L-rd your G-d": Because it is written (Shemoth 23:16) "And the festival of the harvest (Shavuoth) the (time of bringing the) first-fruits of your labor," I might think, if you "harvest, you make a festival, and if not, you do not make a festival; it is, therefore, written "and you shall make a festival of weeks to the L-rd your G-d" — Whether or not you have a harvest, you make a festival.