신명기 16:9의 주석

מהחל חרמש בקמה [BEGIN TO NUMBER SEVEN WEEKS] FROM THE TIME THOU BEGINNEST TO PUT THE SICKLE TO THE CORN — i.e. from when the “Omer” has been cut (from the sixteenth of Nisan) which is the first produce to be harvested (Leviticus 23:10) (cf. Sifrei Devarim 136:2-3; Menachot 71a).

FROM THE TIME THE SICKLE IS FIRST PUT TO THE STANDING CORN. The meaning thereof is “from the time you begin to put the sickle to the standing corn,” seeing that He has already mentioned when we are to begin to raise the sickle upon the standing corn in bringing the omer [a measure of the new barley brought as a meal-offering on the second day of Passover] which is the first-fruit of our harvest.³⁵⁷Leviticus 23:11. and the Midrash [of this verse] is:³⁵⁸Sifre, R’eih 316. “It teaches that the omer be reaped only with a sickle.”

מהחל חרמש בקמה, in the standing barley, which is to serve as the Omer offering. We know already from Exodus 9,31 that the barley crop ripens in spring (in the latitudes which include Egypt and the Land of Israel. Ed]. Seven weeks elapse between the beginning of the barley harvest and that of the wheat harvest. Hence you are to count these seven weeks.