Sh'lach
Likkutei Sichos 18 — Why Challah Has No Fixed Minimum Amount
A Midrashic class linking the mitzvah of separating challah to countering idolatry, arguing that crediting nature or one's own skill for success is itself a subtle form of avodah zarah.
Rabbi Schapiro on the Parshah: Shelach
Asks how the spies, chosen by Moshe Rabbeinu as tzadikim, could fall so far as to doubt Hashem's power after witnessing miracle after miracle in the desert. Uncovers their real motive: a calculation that staying in the wilderness, sustained miraculously and free of gashmiyus, would let them serve Hashem more purely than a land requiring plowing and planting. Shows why this reasoning was nonetheless a grave error, since Hashem's purpose in creation is a dirah b'tachtonim, a dwelling place built specifically through engaging the physical world with kedushah, and no amount of spiritually-motivated calculation can override what Hashem actually wants.
Parshas Shlach
A vort on Parshas Shlach exploring Rashi's startling comment that the spies' report implied Hashem himself was overpowered by the nations of Canaan.