http://revach.net/article.php?id=4488

Section: Moadim   Category: Hagadah Shel Pesach
Dayeinu: Rav Chaim Zaitchek - The Secret Recipe To Delicious Mun, The Food Of Malachim
"Sipeik Tzarcheinu BaMidbar Arba'im Shana", Hashem supplied us with Mun to eat in the Midbar for 40 years.  Rashi in Yehoshua (5:11) asks that we received Mun for 30 days less than 40 years, since it started on 15 Iyar a month after Yetzias Mitzrayim and ended on 15 Nissan in Eretz Yisroel.  Rashi answers that the bread we carried out of Mitzrayim became like Mun.

Rav Chaim Zaitchek asks since we know that Man was spiritual food how could ordinary material food turn into spiritual food?  He answers that the food we left Mitzrayim with was with incredible emuna and bitachon.  Mitzrayim was devastated and we turned the table on our sadistic captors.  And now we were just walking away.  We took our belongings and marched out following the call of Hashem to a dangerous barren wilderness without knowing where or what we were headed for.  We only had a thirty day supply of food.

We learn from here, says Rav Zaitchek, that ordinary food that is eaten with Mesiras Nefesh can be transformed in a spiritual entity.  A mere piece of bread can become the holy Mun if we have the right intentions.  We followed Hashem for forty full years and therefore we ate from His special food every step along the way, no matter where the food came from.