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Ibn Ezra on Numbers 4:3/אבן עזרא על במדבר ד׳:ג׳

אמבן שלשים שנה. קרוב מארבע' שבועות:

1FROM THIRTY YEARS OLD AND UPWARD. Close to four weeks.² is related to the word sheva (seven). Hence I.E. believes that shavu’a can also refer to seven years. Thus “four weeks” would equal 28 years. According to I.E. there is a mystical significance to the number seven. See I.E. on Gen. 8:5 (Vol. 1, p. 114, n. 16) and the notes thereto. Also see The Secret of the Torah, a translation and annotation of Ibn Ezra’s Yesod Morah by H. Norman Strickman (Jason Aaronson, NJ, 1995, p. 125).

בבן חמשים שבעה שבועות כי אז יחסר כח הגוף:

2[EVEN UNTIL FIFTY YEARS OLD.] A fifty-year-old is seven weeks of age. The body’s strength then declines.

גמלאכה באהל מועד. מלאכת המשא:

3TO DO WORK IN THE TENT OF MEETING. The work of bearing.