Leviticus 26:5

5. Threshing The cereals of constant mention are wheat and barley, and more rarely rye and millet. Wheat was ripe at the pentecost, called also “the feast of harvest, the first fruits of thy labors.” The fifty days included the period of grain harvest, commencing with the offering of the first sheaf of the barley harvest in the passover, in April, and ending with that of the two first loaves made from the wheat harvest. So abundant would be the harvest that six months, from mid Nisan to mid Tisri, would be occupied in gathering the produce of the soil; first the harvesting and threshing of the grain and then the vintage, which would be prolonged till sowing time, about the autumnal equinox. See Amos 9:13, note. “The threshing comes between the reaping and the treading of grapes. Reaping is done in April, May, and June, and the vintage is in September and October. Hence the harvest, according to the promise, is to be so abundant that it will take several months to tread out the grain. And here, again, actual experience suggested the language of the prophecy. In very abundant seasons I have seen the threshing actually prolonged until October. Take the three promises together, and they spread over the entire year of the husbandman.” Dr. W.M. Thomson.