http://revach.net/article.php?id=3355

Section: Parshas HaShavua   Category: Life Lessons
Parshas Bo: Rav Yaakov Kaminetzky - Let The Geula Wait
Rav Yaakov Kaminetzky points out the incredible loyalty that Bnei Yisroel showed to the mitzvos on the night of Yetzias Mitzrayim.  In light of the dying all around, Paroh came running and screaming that everyone should leave Mitzrayim immediately.  Paroh has a bad track record of changing his mind after the Maka passes.  Who knows what would happen if they don't leave right away and wait until the morning?  However Hashem commanded them not to leave their homes until the morning. 

This is a lesson for the last generation, says Rav Yaakov.  When the big moment of Moshiach's arrival finally comes, if it entails violating a single aveira, then the geula can be postponed and do not under any circumstances be oveir, no matter the repercussions.