“And you murmured in your tents and said ‘Because Hashem hated us He has brought us forth out of the land of Mitzrayim to deliver us into the hands of the Emori.’ ” (Devarim 1:27)
Rashi explains that the term “murmuring” refers to speaking slander and evil.
When we think about the lessons of bein hameitzarim we have to trace the source of these painful weeks.
Midrash Rabbah discusses the pasuk “And the nation cried on this night” (Bamidbar 14:1). Hashem said: “You cried for no reason I’ll establish for you a time of crying for generations.” That’s when it was decreed that the Beis Hamikdash be destroyed and Yisrael exiled.