7th day of Adar – Who Says?
The only Yahrtzeit (Yiddish word for anniversary of someone’s passing) mentioned in the Torah is that of Aharon. So how do we know that Moshe passed away on the 7th of Adar?
Here’s how. We read in the Book of Yehoshua (the first Book of the Prophets, a.k.a. Nevi’im) that Bnei Yisrael entered Eretz Yisrael on the 10th of Nissan, after 3 days of preparation for the trip. This happened after the Jews had mourned Moshe for 30 days. Thirty-three days before 10 Nissan is the 7th of Adar.
And how do we know that Moshe was born on the 7th of Adar?
Simple. On the last day of his life, Moshe said, “Today I am 120,” meaning that it was his 120th birthday.