Moses’ Passing and Length of Adar
Moses died on the seventh of Adar. The Talmud proves this as follows-
1. In Deuteronomy 34:8 we read that the Jews mourned for thirty days following Moses’ death.
2. The book of Joshua begins with G‑d’s command to bring the Jewish people across the Jordan River. G‑d specifies that they are to cross in three days time. This instruction was given immediately after Moses died, meaning at the earliest possible opportunity after his death.
This would have been following the thirty days of mourning.
3. In Joshua 4:19 we are told that the Jews crossed the river on the tenth of Nissan.
If we subtract the three days between the command and actual crossing, plus the thirty days of mourning, we find the date of Moses’ passing is the seventh of Adar.
Your answer to one of my previous questions was that the month of ADAR always has 29 days, except when there are two months of Adar, then the first one always has 30 days.
My understanding is that Sheloshim for 30 days starts after burial.
Am I correct that Moses died and was buried on the same day?
Did the Jews start mourning for Moses on the same day as he died?