לֹ֤א תַעֲבָר־בָּהּ֙ רֶ֣גֶל אָדָ֔ם וְרֶ֥גֶל בְּהֵמָ֖ה לֹ֣א תַעֲבָר־בָּ֑הּ וְלֹ֥א תֵשֵׁ֖ב אַרְבָּעִ֥ים שָׁנָֽה׃
Walang paa ng tao ang dadaan doon, at walang paa ng hayop ang dadaan doon, at hindi ito tatahanan sa loob ng apatnapung taon.
Rabbeinu Bahya
You will find that the number seven appears three times each in connection with both the cows and the ears of corn. Once it appears in the Torah’s report of Pharaoh’s dream, once in the dream as related by Pharaoh, and the third time when Joseph refers to this number when he interprets the dream. When you multiply the number 14 (seven cows plus seven ears of corn) you get the number 14. When you multiply this number by three you get 42, [an allusion to the numerical value of one of the names of G’d, the first 42 letters in the Book of Genesis until the letter ב in ובוהו — Ed.] None of the numbers “seven” mentioned in our passage went to waste, every one of them became historically relevant as pointed out by Ezekiel 29, 10-11: “Assuredly I will deal with you and your channels, and I will reduce the land of Egypt to utter ruin and desolation; from Migdol to Syene all the way to the border with Nubia. No foot of man shall traverse it; it shall remain uninhabited for forty years.” The first two of these forty years occurred during the time of Joseph before Yaakov came to Egypt. The remaining forty years of the prophecy Pharaoh dreamt occurred later on in Egyptian history.