Hachodesh Asher Yeshuos Bo Makifos *
The gemoro (Shabboss87b) says that the first day of Nissan, the second year in the Midbar, The Mishkan was erected and that day was crowned with ten firsts.
One of them was the first day of the week.(Sunday).
Tosfos (Menachos 30a) quotes the Seder Olam that Moshe Rabbeinu was niftar on a Friday.(7th. Adar)
Many Rishonim hold ,In the Midbar where the Ananei Hakovod covered the moon, they were mekadesh the Chodesh al pi cheshbon and not with eidei riyah.
Reb Michoel Ber Weissmandel asked, according to Cheshbon if the 1st. of Nissan falls on a Sunday then the 7th of Adar is not on a Friday.
* Yotzer P. Hachodesh Musaf
Possible solution to R. Weissmandel's zt"l question:
The Gemoro asks who wrote the last eight Pesukim in the Torah (Vayomos Shom Moshe-)
and answers two tirutzim.
The Zohar has a third answer. "Moshe was niftar and Hashem brought him back
to life. Moshe wrote then the last eight Pesukim, and died again."
The Malbim has a beautiful pshat on the Pasuk “Toras Hashem Temima”-The Torah
is complete – “Meshivas Nofesh”- because Hashem brought back the nefesh of Moshe
to complete the last eight Pesukim in the Torah.
With this Zohar we might be able to answer R.Weissmandel’s question. (also Tosfos
It is possible that Moshe died on Friday the 6th of Adar. He was brought back to life
and wrote the 13 Sifrei Toras on Friday. He died again on Shabbos the 7th of Adar.*
*Tosfos quotes the Seder Olam Friday the 7th Adar