From Heavenly Mann to Earthly Bread
Our Sages of the Talmud tell us that Moshe already instituted this “thanksgiving” prayer 40 years earlier when the people were fed the miraculous Mann. That means Bnei Yisrael were saying Birkas HaMazon in the desert on a daily basis. If that’s so, they must have all been Birkas HaMazon experts. So, why did Moshe choose to tell them now about this Mitzvah?
Think about it – If you would witness this Lechem Min HaShamayim (food falling from heaven) day in, day out, wouldn’t you thank HaShem for this miracle? And don’t forget… this Mann tasted like any food you could imagine.
But now, things are about to change. No longer will Bnei Yisrael receive this “miracle food.” As they enter the Land, they will have to work hard to plant, prune, pick, and pack their produce. Making bread will be a long and difficult process. So, it’s very possible that they may “forget” that without HaShem there would be no bread!
Perhaps, for this reason, Moshe stressed how much we must thank HaShem even when it’s Lechem Min Ha’Aretz (“bread from the ground”).