Exode 10:4

But if thou refuse to let My people go, behold, tomorrow I bring the locust upon thy borders,

BEHOLD, TOMORROW WILL I BRING LOCUSTS. Commentators have said that there was a long interval between the plague of hail and that of locusts, as is suggested by the expression, and [the locusts] shall eat every tree which groweth for you out of the field. In my opinion, the interval between these plagues was not a long one but rather was very brief. It is known that the judgment of the Egyptians did not last more than a year, this being so established through our knowledge of the years of Moses our Teacher, just as we have been taught in Tractate Eduyoth: “The judgment of the Egyptians in Egypt endured twelve months.” And so it is indicated by Scripture when saying, and they shall eat the residue of that which is escaped, which remaineth unto you from the hail. And it is further written, even all that the hail had left, thus indicating that it was in that very same year. If so, [we must say that] the hail came down that year during the month of Adar, not before, for the barley was in the ears [and therefore smitten by the hail], but the wheat had not grown up, Verse 32. and therefore its tender sprouts could not be completely destroyed by the hail, as they would grow back again. Then too the vine had not yet budded, and the trees were not in flower. It is for this reason that Scripture states, and [the hail] broke every tree of the field, meaning that it broke the branches and boughs. Then, in one month’s time, in the month of Nisan, the wheat and the spelt grew, these being the residue of that which is escaped, which remaineth unto you from the hail, and the trees began to blossom and the flowers appeared. This then is the purport of the word hatzomei’ach (which groweth), since the locusts came and ate their blossoms and thus destroyed everything since they did not leave them a blossom or flower. And in this very month, the children of Israel were redeemed [from Egypt]. The verse which states [that the locusts consumed] all the fruit of the tree, [which would indicate that there were fruits already on the tree and, therefore, that a long interval must have passed between the plagues of hail and locusts], is to be understood as referring to the flower which produces the fruits, similar to the expression, every herb on the tree, [which cannot be understood literally, since herbs do not grow on trees. Consequently, it must be understood as Rashi has it: “any green leaf on the tree.” Here too then, “the fruit of the tree” is not to be taken literally, but should be understood as “the flower of the tree”].