Rav Moshe Shapiro spoke at Yeshivas Ner Yisroel in Baltimore on the topic of Birkas HaChama. it can be downloaded HERE.
And here is a fundamental shiur by Rabbi Boruch Leff, also in Baltimore, that must be heard by anyone cleaning for Pesach. He gives over a piece from Bilvavi Mishkan Evneh on the thoughts one should be having while cleaning for Pesach. It is fundamental for any Jewish person to hear and internalize these ideas! You can download that shiur HERE.
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