Parashas Vezos Haberachah · Passuk from filename
Torah Temimah points to Torah Temimah citation.
English: It was taught: Moshe died on the seventh of Adar… Count back thirty-three days, and you learn that Moshe died on the seventh of Adar.
Custom (A chronological calculation based on the mourning period and the date of the crossing of the Jordan.)
From the thirty days of mourning, the three days of preparation under Yehoshua, and the date of the crossing on the tenth of Nisan, the Sages reverse-calculate that Moshe’s death occurred on the seventh of Adar. The same date is also the date of his birth, completing the exact measure of his years.