Musar su Esodo 38:6

What was the point of lumping together the three tribes whose names each begin with the letter א? Why, according to the version in the Yalkut, did G–d first mention the letter ל as an example for the tribe of Levi, whereas in the actual count the tribe of Levi is not even mentioned? Besides, once G–d had told Moses how to arrive at the number, what need was there to count them individually? Another difficulty in the Yalkut is the very number 597,000; we know that the correct number was 603,550! This last question may be solved by remembering that the actual count took place after the Day of Atonement, when G–d had forgiven the Jewish people for the sin of the golden calf. We have to simply assume that between the 17th of Tammuz, the date Moses descended from Mount Sinai, and the Day of Atonement some 80 days later, an additional 6,550 young men had attained the age of 20. The cut-off date for birthdays was the first of Tishrey, as explained by Rashi.